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The experiment is Determination of Acetic Acid in Vinegar. Please answer as many questions as you...

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Chemistry

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?

Answer & Explanation Solved by verified expert
4.3 Ratings (870 Votes)
What are primary and secondary standards Give examples Ans A primary standard is a reagent that is extremely pure stable it has no water of hydration and has a high molecular weight Eg sodium carbonate Na2CO3 mol wt 10599 gmol tris hydroxymethyl aminomethane CH2OH3CNH2 mol wt 12114 gmol A secondary standard is a standard which is usually standardized against a primary    See Answer
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