Methyl orange, HMO, is a common acid-base indicator. In solution it ionizes according to the equation: HMO(a q) (red)= H* (a q) + MO minus (a q)(yellow) What color will the solution turn if H* is added and why?
Methyl orange, HMO, is a common acid-base indicator. In solution it ionizes according to the equation: HMO(a q) (red)= H* (a q) + MO minus (a q)(yellow) What color will the solution turn if H* is added and why?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![**Methyl Orange Indicator and Acid-Base Reaction**
Methyl orange, abbreviated as HMO, is a common acid-base indicator. In solution, it ionizes according to the following equilibrium equation:
\[ \text{HMO(aq) (red)} \rightleftharpoons \text{H}^+ \text{(aq)} + \text{MO}^- \text{(aq) (yellow)} \]
**Question:** What color will the solution turn if \(\text{H}^+\) is added and why?
**Options:**
- ○ Yellow. \(\text{H}^+\) concentration decreases. Reaction moves to the left.
- ○ Yellow. \(\text{H}^+\) concentration increases. Reaction moves to the left.
- ○ Yellow. \(\text{H}^+\) concentration increases. Reaction moves to the right.
- ● Red. \(\text{H}^+\) concentration increases. Reaction moves to the left.
- ○ Red. \(\text{H}^+\) concentration decreases. Reaction moves to the right.
- ○ Red. \(\text{H}^+\) concentration increases. Reaction moves to the right.
- ○ Yellow. \(\text{H}^+\) concentration decreases. Reaction moves to the left.
**Correct Answer:**
- ● Red. \(\text{H}^+\) concentration increases. Reaction moves to the left.
**Explanation:**
When \(\text{H}^+\) ions are added to the solution, the concentration of \(\text{H}^+\) increases. According to Le Chatelier's principle, the equilibrium will shift to the left to decrease the concentration of added \(\text{H}^+\). As a result, the solution turns red, which indicates the presence of more HMO(aq).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc02bfde4-a78d-4551-93f6-03d589a5c8dc%2F988d1991-4d00-4211-b757-0443fcce9313%2Fx79dhvp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Methyl Orange Indicator and Acid-Base Reaction**
Methyl orange, abbreviated as HMO, is a common acid-base indicator. In solution, it ionizes according to the following equilibrium equation:
\[ \text{HMO(aq) (red)} \rightleftharpoons \text{H}^+ \text{(aq)} + \text{MO}^- \text{(aq) (yellow)} \]
**Question:** What color will the solution turn if \(\text{H}^+\) is added and why?
**Options:**
- ○ Yellow. \(\text{H}^+\) concentration decreases. Reaction moves to the left.
- ○ Yellow. \(\text{H}^+\) concentration increases. Reaction moves to the left.
- ○ Yellow. \(\text{H}^+\) concentration increases. Reaction moves to the right.
- ● Red. \(\text{H}^+\) concentration increases. Reaction moves to the left.
- ○ Red. \(\text{H}^+\) concentration decreases. Reaction moves to the right.
- ○ Red. \(\text{H}^+\) concentration increases. Reaction moves to the right.
- ○ Yellow. \(\text{H}^+\) concentration decreases. Reaction moves to the left.
**Correct Answer:**
- ● Red. \(\text{H}^+\) concentration increases. Reaction moves to the left.
**Explanation:**
When \(\text{H}^+\) ions are added to the solution, the concentration of \(\text{H}^+\) increases. According to Le Chatelier's principle, the equilibrium will shift to the left to decrease the concentration of added \(\text{H}^+\). As a result, the solution turns red, which indicates the presence of more HMO(aq).
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