What is the strongest acid in aqueous solution?
A. acetic acid (Ka=1.8x10-5)
B. benzoic acid (Ka=6.3x10-5)
C. formic acid (Ka=1.7x10-4​​​​​​​)
D. hydrofluoric acid (Ka=7.1x10-4​​​​​​​)

To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.

At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.

To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:

pH = pK a + log([base]/[acid])

where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.

At a pH of 7.0, the acid-base equilibrium of EDTA will be:

[EDTA-] = [HEDTA]

At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.

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Answer: very complex .

Explanation:

Answer:

very complex

Explanation: just took the test

The only situation where there is an increase in entropy;

The term entropy has to do with the degree of disorder in a system. Thus we must recall that gases tend to move very freely and the the gas does not have a particular or a fixed shape or volume. Hence, the level of the disorderliness would increase so much when a gas is produced.

The entropy is least when we have a solid because the particles that compose a solid are all held together in such a way that the particles do not move about freely in the system.

Thus, when there is an isothermal compression of the gas, the molecules of the gas collide more frequently with each other and entropy increases.

When a gas expands, it spreads out and entropy is reduced. When a glass of water looses energy, the molecules of the water would decrease in speed and entropy is reduced.

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Carbon dioxide (CO2) concentrations have increased from 280 to about 380 parts per million during the past 150 years (ppm). the reality that human activity is mostly to blame for this.

what is carbon dioxide?

One carbon atom is covalently doubly linked to two oxygen atoms to produce the chemical substance known as carbon dioxide, with the formula CO2. When the temperature is ambient, it exists as a gas. Although it is invisible to visible light when present in the air, carbon dioxide acts as a greenhouse gas by absorbing infrared radiation.

Looking at historical records of human activity reveals that human activity is the cause of the elevated CO2 levels. Since the industrial revolution, we have used fossil fuels and cleared and burned forest area at a rate that has never been seen before, which turns organic carbon into CO2. A careful analysis of the amount of fossil fuel that has been taken and burned, as well as the amount of land cleared, reveals that we have produced significantly more CO2 than is currently found in the atmosphere.

Our estimated 500 billion metric tons of carbon emissions are sufficient to have increased the atmospheric CO2 concentration to just around 500 parts per million.

Since part of the CO2, we produce can be absorbed by the ocean and terrestrial biosphere, the concentrations have not yet reached that level. The apparent increase is, however, explained by the fact that we produce CO2 more quickly than the ocean and biosphere can absorb it.

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Calcium hydroxide reacts with carbon dioxide gives water and calcium carbonate. The balanced equation for the reaction is written as:

\(\rm Ca(OH)_{2} + CO_{2} \rightarrow CaCO_{3} + H_{2}O\)

Calcium carbonate is commonly called limestone. Limestone is mineral deposit found in many living and nonliving things. Rocks and shells of some organisms are major sources of calcium carbonate.

Calcium carbonate can be prepared by passing carbon dioxide through quicklime or calcium oxide CaO. Calcium carbonate will precipitate in a milky solution.

Limestone can also be prepared by the reaction of calcium hydroxide or soda lime with carbon dioxide. Each reacts in one mole and gives one mole of each product as written in the balanced reaction.

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Your question is incomplete. But your complete question probably was:

Calcium hydroxide solution and carbon dioxide gas yields solid calcium carbonate and liquid water. Write the balanced equation for this reaction.

An compound m peak has a relative intensity of 84%, and its m 2 peak is 28% stronger. It's probably chlorine. Chemical element chlorine has the symbol Cl and atomic number 17.

It is the second-lightest halogen, and although it is between fluorine and bromine on the periodic table, most of its properties fall somewhere in the middle. At room temperature, chlorine is a yellow-green gas. It is called chlorine.

A compound is a substance created when two or more chemical elements are chemically bonded together. Ionic and covalent bonds are the two most common types of bonds that hold elements in a compound together.

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The molar concentration of fluoride ions in a saturated solution of calcium fluoride is 3.4 x 10^-4 M.

The solubility product (Ksp) of a substance is the product of the concentrations of its ions in a saturated solution. In the case of CaF2, the solubility product can be expressed as:

Ksp = [Ca2+][F-]^2

Where [Ca2+] and [F-] are the molar concentrations of calcium and fluoride ions, respectively. Since the solubility product for CaF2 is given as 3.9 x 10^-11, we can plug this value into the equation and solve for the concentration of fluoride ions:

3.9 x 10^-11 = [Ca2+][F-]^2

Assuming that the concentration of calcium ions is equal to the concentration of fluoride ions (since CaF2 dissociates into one Ca2+ ion and two F- ions), we can rewrite the equation as:

3.9 x 10^-11 = [F-]^3

Taking the cube root of both sides of the equation gives us:

[F-] = (3.9 x 10^-11)^(1/3)

[F-] = 3.4 x 10^-4 M

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Answer:

B. release oxygen as a product

Explanation:

Answer:

the answer is Crystal structures

Answer:

Since the replication crisis, many practices have been implemented to improve research and promote open science, or the practice of sharing data and materials so they can be reviewed and replicated by other researchers. One of these practices involves submitting the proposed methods and analysis plan to journals in advance for approval or preregistration. This practice allows scientific journals to approve experiments before they are done, with the guarantee that any finding will be published regardless of whether or not it is significant. This process also prevents researchers from harking, or creating theories or hypotheses that explain the results of a study after the data has been collected.

Explanation:

The blanks in the text above were filled with the terms that best fit the context and meaning of the message that the text, in general, wanted to convey. No grammatical element and no punctuation has been modified, which allows the text to maintain its original coherence and meaning.

The added terms are in agreement with the scientific denominations currently accepted.

The accurate warning is that iodine can stain the body and other surfaces.

The accurate warning about iodine is that "iodine can stain the body and other surfaces."

Iodine is a chemical element that is commonly used as an antiseptic and disinfectant. It has a characteristic dark purple color and can easily stain surfaces, including the skin and other materials. The staining is temporary but can be difficult to remove. Therefore, it is important to handle iodine with care to prevent stains and to take appropriate precautions to avoid contact with surfaces that can be easily stained.

The other statements provided are not accurate warnings about iodine:

Iodine is not highly flammable. While iodine can react with certain compounds, it is not known for its flammability.

Iodine is not a biohazard. It is commonly used in various applications, including medicine and laboratory procedures, with appropriate safety measures in place.

While iodine can react with water, it does not react dangerously. The reaction produces a mixture of iodine and iodide ions in an aqueous solution, commonly known as iodine water or iodine solution. This solution is commonly used as an antiseptic.

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Students are conducting an experiment to see what colors different salts turn when they are burned. Jack dares Rebecca to taste the other salts to see if they taste like regular table salt. She agrees and her mouth starts burning. Rebecca needs to learn how to behave in the class.

When you add salt to a fire, the flame's color will alter. This isn't because the salt is burning; rather, it happens because the flame's heat affects the energy of the salt's electrons, which causes photons of light to be released. When salt is "burned," a golden flame is frequently visible.

High blood pressure is known to increase the risk of stroke and other health issues, and it is also known to increase the chance of burning in salt. High salt consumption has also been linked in several studies to deteriorating brain function. So, if this occurs, plan for brain surgery and a dedicated teacher to assist the student with wiping and peeling bananas.

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Answer:the liquid

Explanation: its harmful

Each statment correct phrase is completed.

1- Conformers are organisms that do not regulate their internal condition to the environment that habitat.

2- A change is an organisms surrounding that causes the organisms to react is called a stimulus.

3- soil,water and weather are abiotic factors of habitat.

4-An ecosystem consist of all the living organisms in an area.

6- ecology is the study of how organisms interact with one another and with their physical environment.

7-The many different species live together in a habitat are called a community.

8-ecology is the study of organisms and how they interact with the environment around them.

9-organisms that eat producers are called primary consumer.

10-The physical aspects of habitat are called abiotic factors.

11-A place where paticular population of species lives is called it's habitat.

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Answer:

Light gates

Explanation:

Light gates are used because of their accuracy. They can be set to react very quickly when the beam is broken which eliminates human reaction time errors.

We can see that the pressure of the gas has remained the same. Therefore, the answer is: It has stayed the same.

According to the Ideal Gas Law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature.

If the volume of a fixed amount of gas is doubled, and the absolute temperature is doubled, then the new values of volume and temperature are V' = 2V and T' = 2T, respectively.

Using the Ideal Gas Law, we can write:

P'V' = nRT'

Substituting V' and T' and rearranging:

P' = (nRT') / V'

P' = (nR x 2T) / (2V)

P' = P

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Explanation:

Matter is the basic unit of all things in the world, whether living or nonliving. It is not only useful in chemistry, but also to other fields of science like physics. Physics deals with motion, so it has something to do with matte especially the movement of molecules for solids and fluids.

Answer: A fossil will usually have remains or impressions of an animal or plant.

Answer:

the answer is b

Explanation:

trust me

Geometric isomers have profound effects on the physical properties properties of compounds. one physical property affected by this geometry is the melting point.

The physical property that will affected by the geometrical isomers are the melting point. let us take an example to understand the effect :

the isomers of 1,2 - dichloromethane is the cis 1,2 - dichloromethane and the trans 1,2 - dichloromethane. the table for the melting point and the boiling point is given below as :

isomers              melting point              boiling point

cis                            -80 °C                         60 °C

trans                           - 50 °C                         48 °C

it can easily be concluded from the table that :

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The reaction between 3-phenylpropyne and D2 (deuterium) in the presence of Pd/C (palladium on carbon) is a catalytic hydrogenation reaction. In this reaction, the triple bond of 3-phenylpropyne is reduced to a single bond, resulting in the addition of two deuterium atoms.

The organic product of this reaction is 3-phenylpropane-d2. The triple bond between the carbon atoms in 3-phenylpropyne is converted into a single bond, and two deuterium atoms (D) replace two hydrogen atoms (H). The phenyl group (C6H5) remains intact. The deuterium atoms are isotopes of hydrogen, containing a neutron in their nuclei. Thus, the resulting product, 3-phenylpropane-d2, contains deuterium atoms instead of hydrogen atoms, while the overall structure of the molecule remains the same.

Overall, the reaction between 3-phenylpropyne and D2 in the presence of Pd/C leads to the formation of 3-phenylpropane-d2, where the triple bond is converted to a single bond and two deuterium atoms replace two hydrogen atoms.

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Explanation:

Given:

20.5 torr

78.6 torr

225 torr

Change into atm

Computation:

We know that;

1 torr = 0.00131579 atm

So,

1. 20.5 torr

= 20.5 x 0.00131579 atm

= 0.02697

= 0.027 atm (Approx)

2. 78.6 torr

= 78.6 x 0.00131579 atm

= 0.103090

= 0.103 atm (Approx)

3. 225 torr

= 225 x 0.00131579 atm

= 0.2960

= 0.296 atm (Approx)

Answer:

The oxidation state of chromium is +6

Explanation:

Let the oxidation number be x

Since The sum of all oxidation numbers are equal to zero,

So,

(+1)2 + 2x + (-2)7 = 0

+2 +2x -14 = 0

2x-12 = 0

2x = +12

Dividing 2 to both sides

x = +6

Answer:

t

Explanation:

Answer:

Its false because electronegativity is affected by both the atomic radius and the distance at which its valence electrons reside from the charged nucleus

Explanation:

plz give me brainlyest thx

Answer:

m=(0.92g/ml)(100ml)

=92g

hope this helps

The mass of 100 mL of corn oil will be approximately 92 grams.

The mass of a substance can be calculated using its density and volume. Density is termed as the amount of the mass of per unit volume. In the case of corn oil, its density is typically around 0.92 grams per milliliter (g/mL).

Given:

Volume = 100 mL

Density of corn oil = 0.92 g/mL

To find the mass, we use the formula;

Mass = Volume × Density

Substituting the given values;

Mass = 100 mL × 0.92 g/mL

Calculating:

Mass = 92 grams

This means that for every milliliter of corn oil, there is approximately 0.92 grams of mass. Therefore, the mass of 100 mL of corn oil is approximately 92 grams.

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Answer:

94.1 %

Explanation:

We firstly determine the equation:

2H₂O + O₂ →  2H₂O₂

2 moles of water react to 1 mol of oxygen in order to produce 2 moles of oxygen peroxide.

We convert the mass of oxygen to moles:50 g . 1mol /32g = 1.56 mol

Certainly oxygen is the limiting reactant.

2 moles of water react to 1 mol of oxygen.

13 moles of water may react to 13/2 = 6.5 moles. (And we only have 1.56)

As we determine the limiting reactant we continue to the products:

1 mol of O₂ can produce 2 moles of H₂O₂

Then 1.56 moles of O₂ will produce (1.56 . 2) = 3.125 moles

We convert the moles to mass: 3.125 mol . 34 g/mol= 106.25 g

That's the 100% yield or it can be called theoretical yield.

Percent yield = (Yield produced / Theoretical yield) . 100

(100g / 106.25 g) . 100 = 94.1 %

Answer:

C

Explanation:

d=300

t=6hr

speed=?

speed=300/6

speed=50m/hr the important thing in this question is to get the right units

Answer:

5 would be the large intestine

Explanation:

The product that would be formed from the reaction of benzoyl chloride with aqueous NaOH is benzoic acid (C₆H₅COOH).

Benzoyl chloride (C₆H₅COCl) reacts with NaOH (aqueous) to form benzoic acid (C₆H₅COOH), NaCl, and water (H2O). Benzoyl chloride is treated with a base like sodium hydroxide (NaOH) to produce a carboxylic acid. The reaction is known as hydrolysis because water is added to the compound to break down the bonds and produce a new molecule.

The balanced chemical equation is:

C₆H₅COCl + NaOH → C₆H₅COOH + NaCl

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The pH of a 0.25 M solution of NaNO2= 6.65.

Given the concentration of NaNO2, we can find the concentration of NaOH and HNO2 as follows:

NaNO2 = 0.25 MNaOH = HNO2 = x

(since they have equal concentrations due to the stoichiometry of the reaction)

Thus, we can write the equilibrium constant expression as:

Ka = x^2/0.25

Now, let's solve for x:

x^2 = 0.25 x 4.5 x 10^-4x = √(0.25 x 4.5 x 10^-4) = 0.015

This value represents the concentration of both HNO2 and NaOH. Since we are interested in pH, we need to find the concentration of H+ ions using the following equation:

Kw = [H+][OH-]

Since we have found the concentration of OH- (which is the same as the concentration of NaOH),

we can solve for H+:

Kw = 1.0 x 10^-14[H+][0.015] = 1.0 x 10^-14[H+] = 6.7 x 10^-13

Finally, we can find pH:

pH = -log[H+]pH = -log(6.7 x 10^-13)pH = 6.65

Therefore, the correct option is d) pH = 6.65.

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