Chemistry Challenge: Calculate the Percent by Mass of Hydroiodic Acid

How can we determine the percent by mass of hydroiodic acid in a mixture?

In a 12.4 g sample of an aqueous solution of hydroiodic acid, 29.5 ml of 0.343 M sodium hydroxide are required to neutralize the acid. How do we calculate the percent by mass of hydroiodic acid in the mixture?

Step by Step Calculation:

First, calculate the moles of sodium hydroxide used.

Next, determine the moles of hydroiodic acid present.

Then, calculate the mass of hydroiodic acid using the moles and molar mass.

Finally, find the percent by mass of hydroiodic acid in the mixture.

Explanation:

To calculate the percent by mass of hydroiodic acid in the mixture, we first determine the moles of sodium hydroxide used to neutralize the acid. This helps us find the moles of hydroiodic acid present in the sample. By using the molar mass of hydroiodic acid, we can calculate the mass of hydroiodic acid in the mixture. Dividing this mass by the total mass of the mixture allows us to determine the percent by mass of hydroiodic acid.

In the given scenario, the percent by mass of hydroiodic acid is approximately 10.45% in the mixture. This calculation involves understanding the mole-to-mole ratio of the reactants, the molar masses of the substances involved, and the concept of percent composition in chemistry.

By following the steps provided and understanding the chemical reactions involved, you can successfully determine the percent by mass of hydroiodic acid in a mixture. Chemistry challenges like these allow for a deeper understanding of chemical reactions and their quantitative aspects.