Question

• Another student diluted her acetic acid sample with 10 ml of water before titrating with NaOH. Does this change the concentration of the acetic acid sample? Explain. • Does this change the pk, determined from the graph? 3. Look at all of your titration curves. Starting at 1 mL past the neutralization point, what can you say about all four graphs? 4. Use your concentration of acetic acid in mol/L and a density of 0.9987 g/mL for the acetic acid to calculate the concentration of acetic acid in mass % (g acetica acid/g sample x 100)

Answer 1

Molarity is defined M = moles / Volume in L

since water is added no. of moles of acid will remain same but volume will change and this will change the molarity

hence concentration will change (decrease)

Also , on dilution degree of dissociation increases hence dissociation constant Ka increases

since pKa = -log Ka hence if Ka changes the pKa will also change

For rest of the question, graph and experimental data is not given

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