Consider how to prepare a buffer solution with pH = 3.19 (using one of the weak...

Consider how to prepare a buffer solution with pH = 3.19 (using one of the weak acid/conjugate base systems shown here) by combining 1.00 L of a 0.435-M solution of weak acid with 0.358 M sodium hydroxide.

Weak Acid	Conjugate Base	K_a	pK_a
HNO₂	NO₂^-	4.5 x 10^-4	3.35
HClO	ClO^-	3.5 x 10^-8	7.46
HCN	CN^-	4.0 x 10^-10	9.40

How many L of the sodium hydroxide solution would have to be added to the acid solution of your choice?

Expert Solution

Consider how to prepare a buffer solution with pH = 3.19 (using one of the weak acid/conjugate base systems shown here) by combining 1.00 L of a 0.435-M solution of weak acid with 0.358 M sodium hydroxide.
total moles of acid = 1 x 0.435 = 0.435 mol

pH = 3.19

pKa = 3.35

HNO2 + NaOH ---------------> NO2- + H2O

0.435 0.358V 0 0

0.435-0.358V 0 0.358V

pH = pKa + log [NO2- / HNO2]

3.19 = 3.35 + log [0.358 V / 0.435 - 0.358 V]

[0.358 V / 0.435 - 0.358 V] = 0.6918

0.358 V = 0.30095 - 0.2477 V

V = 0.5 L

volume of sodium hydroxide = 0.500 L

queen_honey_blossom answered 3 years ago

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