calculate the ph of a buffer that contains 0.38 m hydrofluoric acid and 0.86 m fluoride. ka for hydrofluoric acid is 6.6 x 10-4.

To answer your question, we first need to understand that NH4Cl is a salt that dissociates in water, producing NH4+ and Cl- ions. However, NH4+ can also act as an acid and donate a proton to water, producing H3O+. Therefore, we need to consider the equilibrium reactions that occur in the solution of NH4Cl.

NH4+ + H2O ⇌ NH3 + H3O+

In this reaction, NH4+ is acting as an acid and donating a proton to water, producing NH3 and H3O+. The equilibrium constant for this reaction is called the acid dissociation constant (Ka) for NH4+ and is given by:

Ka = [NH3][H3O+] / [NH4+]

Since NH4Cl dissociates completely in water, the initial concentration of NH4+ is equal to the concentration of NH4Cl, which is 0.060 M. We can assume that the concentration of NH3 produced is negligible compared to the initial concentration of NH4+, so we can simplify the equilibrium expression to:

Ka = [H3O+] / [NH4+]

Substituting the given value for Ka (5.6 x 10^-10) and the initial concentration of NH4+ (0.060 M) into the equation, we get:

5.6 x 10^-10 = [H3O+] / 0.060

Solving for [H3O+], we get:

[H3O+] = 6.6 x 10^-6 M

Therefore, the [H3O+] in 0.060 M NH4Cl is 6.6 x 10^-6 M.

In summary, the [H3O+] in a solution of NH4Cl can be calculated using the acid dissociation constant (Ka) for NH4+. Since NH4+ can act as an acid and donate a proton to water, we need to consider the equilibrium reaction between NH4+ and H2O. The [H3O+] can then be calculated using the initial concentration of NH4+ and the value of Ka. The calculated value for [H3O+] in 0.060 M NH4Cl is 6.6 x 10^-6 M.

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Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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As the distillation head fills with the vapors of lower-boiling compound, the head temperature rises.

What happens to the temperature when you just distill something?

The temperature at which the solution must boil rises as the distillation goes on because the more volatile component boils out quicker. As a result, the distillate's composition varies with time. Because the lower-boiling compound completes the distillation process before the higher-boiling compound's vapors can fill the distillation head and raise the head temperature, the temperature lowers. The lower boiling liquid has finished its distillation process, leaving just the upper boiling liquid, which causes the temperature to begin to fall.

As a result, the impure liquid must be heated up in the flask it is contained in before it can begin to evaporate and reach the thermometer on top.

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Answer:

A.the ability of an object to float

Explanation:

it deleted my answer

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Answer:

11 electrons total and 23amu

Explanation:

This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu.

Answer:

I think he was right but not explaining

Explanation:

I think it is C cause.... the volume of a material is the amount of matter that matterial can hold. it should the the amount of space the whole material takes up.

so C is the answer.

pls make this the brainliest.

not because it is, but because I asked.

Answer:

I hope the link above will be helpful

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\(\boxed{\pmb{\green{\sf{3Mg(s) + N_{2}(g)\dashrightarrow Mg_{3}N_{2}(s)}}}}\)

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The nuclear equation of the beta decay of 39/17 Cl is as follows:

39/17 Cl → 39/18 Cl + 0/-1 e

A nuclear reaction is a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

The reaction products may contain a different element or a different isotope of the same element due to this change.

A beta decay is a nuclear reaction in which a beta particle (electron or positron) is emitted. A beta particle is an energetic electron or positron produced as the result of a nuclear reaction or nuclear decay. A beta decay occurs as depicted below;

A/Z X → A/(Z + 1) X‘ + e

Where;

Therefore, if a 39/17 Cl undergoes beta decay, the nuclear reaction can be given as follows:

39/17 Cl → 39/18 Cl + 0/-1 e

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The mass of the object obtained is 1.32 g and the percent yield is  34.3%.

We know that the reaction equation shows the way the reactants are able to interact so as to obtain the products. We have that;

Number of moles of sodium sulfate = 0.196 M  * 57.9/1000 L

= 0.011 moles

Number of moles of magnesium chloride = 0.398 M * 167/1000 L

= 0.066 moles

Given that the reaction is 1:1, the limiting reactant is sodium sulfate

Then;

Mass of the magnesium sulfate produced = 0.011 moles * 120 g/mol

= 1.32 g

The percent yield of the magnesium sulfate = 0.453 g/ 1.32 g * 100/1

= 34.3%

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The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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On a dry day, your hair flies apart when you brush it due to static electricity. Static electricity is produced by rubbing two materials together, such as when you brush your hair. The rubbing causes electrons to transfer from one material to another, creating an imbalance of electric charges.

Some materials, such as your hair, tend to hold onto their electrons more than others, causing them to become negatively charged. When you brush your hair, the negatively charged strands repel each other, causing them to fly apart. This effect is most pronounced on dry days when the air is less humid, as dry air allows charges to build up more easily.

Humid air, on the other hand, can help to dissipate static charges, reducing the amount of flyaway hair. Static electricity can also cause your hair to stick to other objects, such as clothing or hats. To prevent this, you can use an anti-static spray or conditioner, which helps to neutralize the charges that cause static electricity.

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Answer:

Curvature

Explanation:

In mathematics, curvature is any of several strongly related concepts in geometry. Intuitively, the curvature is the amount by which a curve deviates from being a straight line, or a surface deviates from being a plane. For curves, the canonical example is that of a circle, which has a curvature ... For being meaningful, the definition of the curvature and its different

The given substance is a mixture.

A mixture in chemistry is a compound made up of two or more simpler components. Compounds or chemical elements can be these items. You can create a mixture of liquids, solids, or gases. For instance, sugar dissolves to produce a solution when it is added to water, forming a mixture first.

A combination that has an uneven makeup is said to be heterogeneous. It is referred to be a heterogeneous mixture when two components are combined but remain distinct from one another. Examples of heterogeneous mixtures: One such mixture is concrete.

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Answer: 2.13

Explanation: i crawled so you could run :)

Answer:

22.4 L

Explanation:

D. Able to answer for one's conduct and obligations

The amygdala is a pair of almond-shaped structures located in the brain's temporal lobes. It is part of the limbic system, which is involved in the processing of emotions and memory. The amygdala is involved in the formation of memories associated with emotional events, as well as the reaction to those memories.

The amygdala also plays a role in the regulation of the body's fight-or-flight response, which is the autonomic nervous system's response to danger or perceived danger. It is thought to be involved in the formation of fears and phobias, as well as the development of aggressive behaviors. In addition, the amygdala is believed to be involved in the processing of social cues, such as facial expressions and body language.

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Answer:

B. its tilt toward the sun

Explanation:

Answer:The primary reason is the tilt of the earth towards the sun

Bicarbonate (HCO3-) would be part of the explanation for taking bicarbonate (NaHCO3) for excess stomach acid.

When mixed with water, sodium bicarbonate dissociates into Na+ and HCO3-. Bicarbonate acts as a base that reacts with the acid in the stomach to neutralize it, causing carbon dioxide gas and water to be produced as by-products. This makes sodium bicarbonate an effective antacid for treating heartburn and other forms of acid reflux.The neutralization reaction can be written as follows:NaHCO3 + HCl → NaCl + CO2 + H2O

Where NaHCO3 is sodium bicarbonate, HCl is hydrochloric acid, NaCl is sodium chloride, CO2 is carbon dioxide, and H2O is water. Bicarbonate neutralizes the acid in the stomach, reducing symptoms of heartburn and other types of acid reflux.

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Answer:

less activation energy

Answer:

The second choice and can i have brainiest

Explanation:

Distinguishing Between Pure Substances and Mixtures

Pure substances can be either elements or compounds. Mixtures can be either homogeneous or heterogeneous. ... Gasoline is thus a blend of different compounds, so it is a mixture.

Answer:

O low ionization energy and more than 4 valence electrons

Explanation:

please Mark as BRAINLIST answer

Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons. Therefore, the correct option is option D.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

118 known elements are present. A study is being done to create element 120.1. The periodic table will have to modified to include element 120 after it has been created and validated. Elements that easily gain (steal) electrons tend to have low ionization energy and more than 4 valence electrons.

Therefore, the correct option is option D.

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Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

The conical flask is an important piece of laboratory equipment that is commonly used in experiments that involve mixing, heating, or storing liquids.

In many cases, this flask is used to collect the filtrate that is obtained from the Buchner flask during a filtration process.
The Buchner flask is used to separate solids from liquids by applying vacuum pressure to the mixture. The solid particles are trapped by a filter paper placed on top of the flask, while the liquid passes through the filter paper and collects in the flask below. This liquid is referred to as the "filtrate".
When the filtrate is collected in the Buchner flask, it is not always perfectly clean. Sometimes there may be small particles of solid material or other contaminants that are still present in the liquid. In order to ensure that the conical flask is free of any contaminants before it is used to store the filtrate, it is important to rinse it with the filtrate from the Buchner flask.
This is because the rinsing process helps to remove any remaining particles or impurities that may be present in the conical flask. By doing this, the filtrate that is collected in the conical flask is less likely to be contaminated, which can help to ensure the accuracy and reliability of any experiments that rely on this liquid.
Overall, rinsing the conical flask with the filtrate from the Buchner flask is an important step in the filtration process, as it helps to ensure that the filtrate is free from contaminants and ready for use in further experiments.

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Answer:

B. Spring balance - a device used for measuring the weight or force of gravity acting on an object.

Explanation:

A Force is any interaction that changes the motion or position of an obkpjectbthatbit is interacting with. Whenever there is an interaction between two objects, there is a force exerted by each of the objects on one themselves.

Forces are generally divided into contact forces and non-contact over field forces.

In contact forces, the two objects physically in contact with each other. Examples of contact forces are push or pull forces, frictional forces, tensional forces, spring forces, etc.

Non-contact forces are forces in which the two objects interacting do no need to be physically in contact with one another. Examples include, gravitational forces, magnetic forces, electrical forces, etc.

Instruments used in measuring forces are known as force gauges.

From the instruments listed above:

A. A ruler is an instrument used in measuring length

B. Spring balance is a device used for measuring the weight or force of gravity acting on an object.

C. A thermometer is an instrument used in measuring temperature

D. A windbvane is an instrument used in measuring wind direction.

Although the pKa constant is 4.8 and is a more straightforward expression, the Ka constant for acetic acid (CH3COOH) is 0.0000158 (= 10-4.8). Additionally, the strength of the acid increases with decreasing pKa values.

For instance, lactic acid has a pKa value of roughly 3.8, which indicates that it is a stronger acid than acetic acid.

Acetic acid, officially known as ethanoic acid, is an organic substance with the chemical formula CH3COOH that is acidic, colorless, and liquid (also written as CH3CO2H, C2H4O2, or HC2H3O2). Apart from water and other trace ingredients, vinegar has at least 4% acetic acid by volume, making acetic acid its primary ingredient.

The second-simplest carboxylic acid is acetic acid (after formic acid). It serves as a significant industrial chemical and reagent in the manufacture of cellulose acetate.

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