How would these mistakes affect the calculation for the percent of acetic acid in vinegar?

Question

How will the following error affect the calculated percent of acetic acid in vinegar? will it increases, decreases, or make the calculated percent remain the same?

a) the buret was wet with water and you failed to coat it with NaOH solution.

b) you added 60mL distilled water to the flask before you start the titration rather than 50mL

Answer 1

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A) Increase

B) Assuming adding more distilled water doesn't change the amount of vinegar you use the calculation will stay the same.

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This was my first titration. My vinegar was only 4.3 % HC2H3O2

Answer 2

Look up dilution

Answer 3

a). You will dilute the NaOH a little so it will take a bit more of it to neutralize the acetic acid and your calculated percentage will increase a small amount

b). Assuming it's all in the flask, you are still titrating the same amount of acetic acid and so there should be no change