CHEM 104 Homework 6 1. 20 points-Ch. 18.1, 19.2 A chemist is testing the propert
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Question
CHEM 104 Homework 6 1. 20 points-Ch. 18.1, 19.2 A chemist is testing the properties of a newly-discovered pair of acids, A1 and A2. She determines them both to be monoprotic and performs several experiments to compare their acid strength . 19.9 in textbook) to 1.0 M aqueous solutions of each acid results in a yellow color for A1 and a green-blue color for A2. .Experiment 2: Measuring the conductivity of the same two solutions results in a higher Experiment 1: Adding a few drops of bromophenol blue (see Fig measurement for A1 than for A2 Experiment 3: Addition of a Zn strip to each solution resulted in vigorous bubbling in the case of A1 and mild bubbling in the case of A2. . Based on these experiments, which is the stronger acid? Explain how the results of each experiment support your choice, and also identify the gas inside the bubbles in Experiment 3.Explanation / Answer
A1 is stronger than A2.
# bromothymol blue exhibit yellow color below the pH 6 and blue for pH above 7.6. So the yellow color for A1 indicates that its pH is less than 6 and green-blue color indicates the pH of A2 is just above 6. Thus A1 is a stronger acid than A2
# From the conductivity measurements, acid A1 exhibit higher conductivity than A2. Since A1 is strong acid than A2, its dissociation will be greater resulted in the higher conductivity.
# Reaction with metallic Zn, it liberates hydrogen gas. In the case of strong acid, the liberation of H2 will be vigorous and in weak acid exhibit mild bubbling.
From the 3 experiments, it is clear that A1 is stronger than A2.