ChemTutor Problem

Problem Statement

It takes 30.70 mL of 0.0996 M NaOH to titrate 25.00 mL of unknown diprotic acid. If 0.145 g of the unknown acid was used in this titration what is the molar mass of the unknown acid?

A.
B.
C.
D.
Correct.
Incorrect.
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Correct.
Incorrect.

Molar Mass

Here are some resources to help you better understand molar mass.

  • Link to ebook 3.6, 3.11
  • Link to a problem from 3.6/3.11

We'll ask a simple problem here:

Correct.
Incorrect.

Stoichiometry

Consider the following equation:

H2A(aq) + NaOH(aq) -> Na2A(aq) + H2O(l)

Balance the equation by entering the appropriate numbers (Don't leave any spaces blank - use 1 if needed):

H2A(aq) + NaOH(aq) -> Na2A(aq) + H20(l)

Correct. You should consider this stoichiometry when they try the original problem again.
Incorrect.

Inverted mole ratio

Any additional help to provide?