State how a buffer solution can be made from solutions of potassium hydroxide and ethanoic acid.
Give an equation for the reaction between potassium hydroxide and ethanoic acid. State how this buffer solution resists changes in pH when a small amount of acid is added.
How buffer solution resists pH change
[3 marks]
MS: CH3COO– (from salt) reacts with (added) acid/H+
I said this, but I also said that because CH3COO- concentration is very low, the OH- ions from the KOH could react with H+ as well, is this idea wrong?..if not why does the markscheme only accept the first statement?
and also another question: when we say all ion concentrations to 1moldm-3 what ions are we regarding that for. E.g. I know for H2SO4 you would normally use 0.5M but surely you could say that the SO4- ions are not 1M anymore...?