A student needs to determine by titration with NaOH the precise %KHP in an unknown sample that is thought to contain approximately 50%KHP. Approximately what mass of sample should the student use in order to use about 20mL of 0.1005 M NaOH to reach the endpoint of the titration?

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A student needs to determine by titration with NaOH the precise %KHP in an unknown sample that is thought to contain approximately 50%KHP. Approximately what mass of sample should the student use in order to use about 20mL of 0.1005 M NaOH to reach the endpoint of the titration?

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Step 1

First, calculate the moles NaOH to determine the moles of KHP

Step 2

The molar ratio between NaOH and KHP is 1:1.

Therefore, the moles KHP = moles of NaOH.

i.e. moles of NaOH = 0.00201 = moles of KHP

Step 3

Calculate the mass of KHP in grams usi...

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