In: Chemistry

Calculate the pH of a solution made by adding 54 g of sodium acetate, NaCH3COO, to 12 g of acetic acid, CH3COOH, and dissolving in water to make 400. mL of solution.

The pH calculation is as given below.

Let us calculate Molarity (M) of CH3COOH and CH3COONa

Molarity = moles/L = g/molar mass x L

M of CH3COONa = 54/82.0343 x 0.4

= 1.65 M

M of CH3COOH = 12/60.05 x 0.4 L

= 0.50 M

Now we have the equation,

CH3COOH <======> H+ + CH3COO-

Initial 0.5 M 0M 1.65 M

change -x +x +x

Equilibrium (0.5-x)M xM (1.65+x)M

--------------------------------------------------------------------------

Thus, we can write,

Ka for CH3COOH = [H+][CH3COO-] / [CH3COOH]

Ka for CH3COOH = 1.8 x 10^-5 [from standard literature]

Thus,

1.8 x 10^-5 = (x)(1.65+x)/(0.5-x)

Considering x be a small amount dissociated, we get,

1.8 x 10^-5 = 1.65x/0.5

x = [H+] = 5.46 x 10^-6 M

pH = -log[H+]

= -log(5.46 x 10^-6)

= 5.26

**Hence pH of this solution will be
5.26**

Calculate the pH of a solution made by adding 44.0 g of sodium
formate, NaHCOO, to 200. mL of 0.23 M formic acid, HCOOH. Hint what
kind of solution is made?
The Ka for HCOOH is 1.8 x 10-4 M. As usual, report pH to 2 decimal
places.

1) What is the pH of a 0.246 M aqueous solution of sodium
acetate, NaCH3COO? This solution is acidic, basic or neutral?
2) The substance benzoic acid
(C6H5COOH) is a weak acid
(Ka = 6.3×10-5). What is the
pH of a 0.110 M aqueous solution of
sodium benzoate,
NaC6H5COO?
This solution is acidic, basic or neutral?
3) What is the pH of a 9.17×10-2 M
aqueous solution of ammonium nitrate,
NH4NO3? This solution is
acidic, basic or neutral?

What is the pH of a buffer solution made by dissolving 10 g of
sodium acetate in 200 ml of 1M acetic acid? The Ka for acetic acid
id 1.7*10-5.
B. Calculate the pH of the solution if 10 ml of 0.100M HCl is
added to the solution.
C. What will the pH be if 5.00 ml of 0.150M NaOH was added to
solution in B?
D. Write the equation when an acid and a base are added to the...

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Calculate the concentrations of all species in a 1.14 M NaCH3COO
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3. Calculate the pH of a buffer solution made by adding 25.5 g
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make 500 mL of the buffer. a. Identify the acid and the base (write
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compared to the pKa of the sample? Why? d. What is the pH of the
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Please Use the ICE method

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