Calculate the pH of a buffer solution produced by adding 4.00g of sodium ethanoate to 1dm^3 of 0.01M ethanoic acid. The Ka of ethanoic acid is 1.84x10^-5 mol/dm^3 at 300K.
Calculate the pH of this buffer if 5cm^3 of 0.1M HCl is added.
I tried using this pka=ph-log HA/H+ but couldn't do it!
Calculate the pH of a buffer solution produced by adding 4.00g of sodium ethanoate to 1dm^3 of 0.01M ethanoic acid. The Ka of ethanoic acid is 1.84x10^-5 mol/dm^3 at 300K.
Calculate the pH of this buffer if 5cm^3 of 0.1M HCl is added.
I tried using this pka=ph-log HA/H+ but couldn't do it!
+rep
find the concentration of A- by finding the moles of ethanoate and then dividing by volume, then stick this into the Ka formula.
Spoiler
The volume of acid added in the second part is very small, so by the definition of a buffer, the pH shouldn't change.