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When do I use the ICE method? Watch

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What is the approximate pH of a buffer solution containing 0.20 mol of a weak acid, HA,(pKa = 4.8) and 0.20 mol of the sodium salt of the acid, NaA, in a total volume of 1 dm3of solution?

I tried solving it by using logs, pH= log[H+]But then I was told to use the ICE methodSo my question is how do I know when to use the ICE method?
Like for instance for this question,
What is the approximate pH of a buffer solution containing 0.20 mol of a weak acid, HA,(pKa = 4.8) and 0.20 mol of the sodium salt of the acid, NaA, in a total volume of 1 dm3of solution?

I tried solving it by using logs, pH= log[H+]But then I was told to use the ICE methodSo my question is how do I know when to use the ICE method?
ICE is for equilibrium, this is a buffers question.

Use ka = [H+][A-]/[HA]
3. (Original post by charco)
ICE is for equilibrium, this is a buffers question.

Use ka = [H+][A-]/[HA]
I see.. Thaanks

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Updated: April 22, 2016
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