The experiment is Determination of Acetic Acid inVinegar. Please answer as many questions as you can.
What are primary and secondary standards? Give examples.
What is KHP and why was it used in this lab?
How is acetic acid formed in vinegar solution?
Why are pH indicators strongly colored even in solid state?
Why/how do pH indicators change colors in acid-basesolutions?
Molar mass of acetic acid is often calculated or experimentallymeasured as 120 g/mol. Why?
Suggest another analytical method to determine the end point ofan acid-base titration.
pH indicators are often weak acids or bases. Would addingindicators interfere with the determination of the endpoint fordesired acid-base titration?
If a solution of NaOH is prepared and standardized today andleft on the bench for a week, would you expect the pH of thesolution change? Why? Ignore solvent (water) evaporation.
You had titrated unknown vinegar solution in flask againststandard NaOH from burette using phenolphthalein indicator. If youhad titrated standard NaOH solution in flask against unknownvinegar solution in burette using the same indicator, would it beeasier or more difficult? Why?
