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You are asked to prepare a pH=9.60 buffer starting from 500 ml of 0.10 M solution of hydrocyanic acid, HCN, and express sodium cyanide, NaCN (Ka for HCN = 4.9 x 10 -4 )

a) What is the pH of the hydrocyanic acid solution prior to adding NaCN?

b) How many grams of NaCN should be added to prepare the buffer solution?

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Elin Hessel
Elin HesselLv2
28 Sep 2019
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Related questions

A buffer solution contains 0.43 mol of hydrocyanic acid (HCN) and 0.75 mol of sodium cyanide (NaCN) in 4.80 L.
The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10.

(a) What is the pH of this buffer?

(b) What is the pH of the buffer after the addition of 0.25 mol of NaOH? (assume no volume change)

(c) What is the pH of the original buffer after the addition of 0.41 mol of HI? (assume no volume change)

A buffer solution contains 0.76 mol of hydrocyanic acid (HCN) and 0.33 mol of sodium cyanide (NaCN) in 5.50 L.
The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10.



(a) What is the pH of this buffer?

pH = ___________.


(b) What is the pH of the buffer after the addition of 0.68 mol of NaOH? (assume no volume change)

pH = _____________.


(c) What is the pH of the original buffer after the addition of 0.27 mol of HI? (assume no volume change)

pH = _______________.

A buffer solution contains 0.70 mol of hydrocyanic acid (HCN) and 0.76 mol of sodium cyanide (NaCN) in 1.90 L.
The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10.



(a) What is the pH of this buffer?

pH = ___


(b) What is the pH of the buffer after the addition of 0.28 mol of NaOH? (assume no volume change)

pH = ____


(c) What is the pH of the original buffer after the addition of 0.56 mol of HI? (assume no volume change)

pH = ___

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