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- Calculate the pH change that takes place when acid or base is added to buffer solutions.
A 1L buffer solution is made from 0.4 mol ethanoic acid (CH3COOH) and 0.4 mol of its conjugate base, ethanoate (CH3COO-). The Ka of ethanoic acid is 1.4*10-5.
What would be the pH change if 0.1 mol of H3O+ was added to this buffer?
- Show the effect of a buffer using a titration curve and find Ka of a weak acid in a buffer.
Below is the titration curve of a weak acid by a strong base:
- At which point in the titration is a buffer effect occurring? Mark the region on the graph.
- pH1/2 during this titration was 3.82. Find the Ka of the weak acid in the buffer using the Henderson-Hasselbach equation.
- Calculate the concentration of solutions needed to prepare a buffer of a given pH.
Ethanoic acid has a Ka of 1.4*10-5. What amounts are required to prepare a 100mL buffer with pH 4.25 using ethanoic acid, CH3COOH and sodium hydroxide, NaOH?
1 Source for acidity constant (Ka) data: ATKINS, P. W., & DE PAULA, J. (2006). Atkins' Physical chemistry. Oxford, Oxford University Press.