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# AQA JAN 11 CHEM 11 - Buffer solution question watch

1. Ive attempted to answer the question, and looking back at the markscheme the mistake im making when working out the moles of HY---- why do you have to times 50 by 10^-3?

The acid dissociation constant, Ka, for the weak acid HY has the value
1.35 x 10–5 mol dm–3 at 25 °C.

A buffer solution was prepared by dissolving 0.0236 mol of the salt NaY in
50.0 cm3 of a 0.428 mol dm–3 solution of the weak acid HY

(i) Calculate the pH of this buffer solution.
2. (Original post by learn777)
Ive attempted to answer the question, and looking back at the markscheme the mistake im making when working out the moles of HY---- why do you have to times 50 by 10^-3?

The acid dissociation constant, Ka, for the weak acid HY has the value
1.35 x 10–5 mol dm–3 at 25 °C.

A buffer solution was prepared by dissolving 0.0236 mol of the salt NaY in
50.0 cm3 of a 0.428 mol dm–3 solution of the weak acid HY

(i) Calculate the pH of this buffer solution.
all concentrations are in moles per litre (1000ml) but you are given the info in ml, so you have to divide by 1000.

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Updated: January 11, 2015
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