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Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section: Chapter Questions
Problem 137QRT
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Chemistry
Potassium chromate forms a bright yellow solution when dissolved in water. Potassium dichromate
forms an orange solution when dissolved in water. One way to make the dichromate ion is to add
acid to a chromate salt according to the following equation:
2 Cro?- (aq) + 2 H,0* (aq)= Cr,03- (aq) + 3 H20 (1)
When a student adds 2 drops of nitric acid to the yellow potassium chromate solution, the solution
turns an orange color. The student then adds 2 drops of sodium hydroxide and the solution turns
yellow. The student then adds 2 drops of sulfuric acid to the solution and it turns orange. The
student then adds 4 drops of sodium hydroxide and the solutions turns back to the original yellow
color.
1. Why did both the addition of nitric acid and sulfuric acid change the solution to an orange
color?
2. Why did the addition of sodium hydroxide change the solution back to a yellow color?
3. Why did it take more sodium hydroxide after the addition of sulfuric acid than nitric acid?
Transcribed Image Text:Chemistry Potassium chromate forms a bright yellow solution when dissolved in water. Potassium dichromate forms an orange solution when dissolved in water. One way to make the dichromate ion is to add acid to a chromate salt according to the following equation: 2 Cro?- (aq) + 2 H,0* (aq)= Cr,03- (aq) + 3 H20 (1) When a student adds 2 drops of nitric acid to the yellow potassium chromate solution, the solution turns an orange color. The student then adds 2 drops of sodium hydroxide and the solution turns yellow. The student then adds 2 drops of sulfuric acid to the solution and it turns orange. The student then adds 4 drops of sodium hydroxide and the solutions turns back to the original yellow color. 1. Why did both the addition of nitric acid and sulfuric acid change the solution to an orange color? 2. Why did the addition of sodium hydroxide change the solution back to a yellow color? 3. Why did it take more sodium hydroxide after the addition of sulfuric acid than nitric acid?
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