please help me Question:1 Write the formula and calculate the molar mass of KHP

Question

please help me

Question:1

Write the formula and calculate the molar mass of KHP (KHP is not potassium hydrogen phosphorus).

Question:2

When conducting this experiment, why is it necessary to standardize your NaOH solution before titrating your unknown acid?

Question:3

Give an example of a triprotic acid other than H3PO4. Write a balanced chemical equation for the reaction of this acid with sodium hydroxide.

Question:4

A 0.4281-g sample of KHP required 26.51 mL of sodium hydroxide solution to reach the phenolphthalein endpoint. Calculate the molarity of the NaOH solution.

Question:5

31.88 mL of the NaOH solution standardized in question 4 was used to titrate 23.75 mL of a citric acid solution to the phenolphthalein endpoint. Calculate the molar concentration of the citric acid solution.

Explanation / Answer

1.Molecular formula, C8H5KO4. Molar mass, 204.22 g mol?1

2.It is often necessary to test a solution of unknown concentration with a solution of a known, precise

concentration. The process of determining the unknown

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