chemistry student weighs out 0.160g of sulfurous acid H2SO3, a diprotic acid, into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1600M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Be sure your answer has the correct number of significant digi

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter1: The Nature Of Chemistry
Section: Chapter Questions
Problem 127QRT
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A chemistry student weighs out 0.160g of sulfurous acid H2SO3, a diprotic acid, into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1600M NaOH solution.

Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Be sure your answer has the correct number of significant digits.

Expert Solution
Step 1

The balanced chemical equation for the reaction between H2SO3 and NaOH is:

H2SO3 + 2 NaOH → Na2SO3 + 2 H2O

From the equation, we can see that one mole of H2SO3 reacts with two moles of NaOH. Therefore, the number of moles of NaOH required to react with 0.160 g of H2SO3 can be calculated as:

 

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