Answers
Answer:
0.804g of NaHCO₃ you must add
Explanation:
pKa of HCO₃⁻/CO₃²⁻ is 10.32.
It is possible to find pH of a buffer by using H-H equation, thus:
pH = pka + log [A⁻] / [HA]
Where [HA] is concentration of acid (HCO₃⁻) and [A⁻] is concentration of conjugate acid (CO₃²⁻).
Moles of CO₃²⁻ = K₂CO₃ are:
4.00g ₓ (1mol / 138.206g) = 0.0289 moles CO₃²⁻
Replacing:
10.80 = 10.32 + log [0.0289] / [HCO₃⁻]
[HCO₃⁻] = 0.009570 moles you need to add to obtain the desire pH
As molar mass of NaHCO₃ is 84.007g/mol, mass of NaHCO₃ is:
0.009570 moles ₓ (84.007g / mol) =
0.804g of NaHCO₃ you must addAnswer:
\(0.8237g\) of \(NaHCO_3\) must be addedExplanation:
Second dissociation of \(H_2CO_3\) is
\(HCO_3^-(aq) <-------> CO_3^2-(aq) + H^+\)
\(Ka = [CO_3^{2-}] [H+] / [HCO_3^-] \\\\= 4.7*10^{-11}\\\\pKa = -log(4.7 * 10^{-11}) \\\\= 10.33\)
\(pH = pKa + \frac{log([A-]}{[HA])}\\\\required pH = 10.80\\\\10.80 = 10.33 + \frac{log([A-]}{[HA])}\\\\\frac{log([A-]}{[HA])} \\\\= 0.47\\\\\frac{[A-]}{[HA]}\\\\ = 2.951\)
\([CO_3^{2-}] / [HCO_3^-] = 2.951\)
\([HCO_3^-] = [CO_3^{2-}]/2.951\)
moles of \(K_2CO_3\) = \(\frac{4}{138.206} = 0.028942mol\)
moles of \(CO_3^{2-}\) = \(0.028942mol\)
\([CO_3^{2-}]\) = \(\frac{0.028942}{500} * 1000 = 0.05788M\)
\([HCO_3^-]\) required = \(\frac{[CO32-]}{2.951} = \frac{0.05788}{2.951} = 0.01961M\)
moles of \(HCO_3^-\) required = \(\frac{0.01961}{1000} * 500 = 0.009805mol\)
moles \(NaHCO_3\) required = \(0.009805mol\)
Therefore,
mass of \(NaHCO_3\) required \(= 0.009805 * 84.007 = 0.8237g\)
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Related Questions
Write the chemical formula for this molecule
Answers
The chemical formula for the molecule you provided is C2H5Cl.
In the molecule, the central atom is carbon (C), which is bonded to two hydrogen atoms (H) and one chlorine atom (Cl). The carbon atom forms single bonds with each of the hydrogen and chlorine atoms, resulting in a linear structure.
To write the chemical formula, we start by indicating the number of atoms of each element present in the molecule. In this case, there are two carbon atoms (C2), five hydrogen atoms (H5), and one chlorine atom (Cl1).
Next, we write the symbols for the elements in the order of their appearance. The formula is typically written with the carbon atom first, followed by hydrogen, and then any other elements in alphabetical order. Therefore, the chemical formula for the molecule is C2H5Cl.
The subscripts in the formula indicate the number of atoms of each element in the molecule. In this case, there are two carbon atoms, five hydrogen atoms, and one chlorine atom.
It's important to note that the formula represents the simplest ratio of atoms in the molecule. It does not provide information about the spatial arrangement or bonding pattern of the atoms. Additional structural information, such as the arrangement of atoms in space, would require a more detailed representation, such as a Lewis structure or a three-dimensional model.
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To prepare a lab solution a chemist dissolves solid potassium chloride in a given
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Answers
The solution could be described like a saturated and concentrated solution.
Solutions
Dissolution of solutions can occur in certain ways. These ways depend on the solvent dilution coefficient and the amount of solute.
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Compute for the pH of 0.415 M HCl acid.
Answers
Answer:
The answer is
0.38Explanation:
HCL is a strong acid and therefore undergo complete dissociation
We have
\( HCL \rarr H^{ + } \: + \: Cl^{ - } \)The concentration of Hydrogen ion is also 0.415 M
The pH of a solution can be found by using the formula
\(pH = - log( {H }^{ + } ) \)
So we have
\(pH = - log(0.415) \\ = 0.381951903...\)
We have the final answer as
0.38Hope this helps you
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Answer:
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Explanation:
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Answer:
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Explanation:
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\( \large{ \tt{❃ \: EXPLANATION}}: \)
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And we're done!\( \large{ \boxed{\tt{⟶OUR \: FINAL \: ANSWER : \boxed{ \underline{ \tt14 \: m {s}^{ - 1} }}}}}\)
✺ Who said grades doesn't matter ? - Your destiny is not going to work every time. Remember that !
\( \large{ \ \tt{ \# \: StayInAndExplore \: ☂}}\)
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Answers
Answer:
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Explanation:
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Answers
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Answer:
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5) According to the quantum theory of atomic structure, an atom has all EXCEPT which of these
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Answers
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Answer:
Yay
Explanation:
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True
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Answers
Answer:
That would be True
Explanation:
granite is a part of the crust layer.
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Answers
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