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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 OH minus 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 OH minus is added and why?

Chemistry
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
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**Understanding Methyl Orange as an Acid-Base Indicator** Methyl orange, denoted as HMO, is a widely used acid-base indicator. In solution, it undergoes ionization as represented by the equation: \[ \text{HMO (aq) (red)} \rightleftharpoons \text{H}^+ \text{(aq)} + \text{MO}^- \text{(aq) (yellow)} \] ### Question: What color will the solution turn if \(\text{OH}^-\) is added and why? ### Options: 1. **Red.** \( \text{H}^+ \) concentration decreases. Reaction moves to the right. 2. **Yellow.** \( \text{H}^+ \) concentration increases. Reaction moves to the left. 3. **Red.** \( \text{H}^+ \) concentration increases. Reaction moves to the left. 4. **Yellow.** \( \text{H}^+ \) concentration decreases. Reaction moves to the left. 5. **Red.** \( \text{H}^+ \) concentration decreases. Reaction moves to the left. 6. **Yellow.** \( \text{H}^+ \) concentration increases. Reaction moves to the right. 7. **Yellow.** \( \text{H}^+ \) concentration decreases. Reaction moves to the right. 8. **Red.** \( \text{H}^+ \) concentration increases. Reaction moves to the right. *(Selected Option)* ### Explanation: When \(\text{OH}^-\) is added to the solution, it reacts with \( \text{H}^+ \), reducing its concentration. This drives the reaction to the right, leading to the formation of more \(\text{MO}^-\), which is yellow. However, the selected correct option indicates that the reaction moving to the right will result in a red color, due to the increase in \( \text{H}^+ \) concentration, which is the equilibrium response to the initial decrease caused by \(\text{OH}^-\). This shows a misunderstanding or correction in the logical assumption, as the equilibriums aim to counter the added base effect by eventually forming more of the red acid form.
Transcribed Image Text:**Understanding Methyl Orange as an Acid-Base Indicator** Methyl orange, denoted as HMO, is a widely used acid-base indicator. In solution, it undergoes ionization as represented by the equation: \[ \text{HMO (aq) (red)} \rightleftharpoons \text{H}^+ \text{(aq)} + \text{MO}^- \text{(aq) (yellow)} \] ### Question: What color will the solution turn if \(\text{OH}^-\) is added and why? ### Options: 1. **Red.** \( \text{H}^+ \) concentration decreases. Reaction moves to the right. 2. **Yellow.** \( \text{H}^+ \) concentration increases. Reaction moves to the left. 3. **Red.** \( \text{H}^+ \) concentration increases. Reaction moves to the left. 4. **Yellow.** \( \text{H}^+ \) concentration decreases. Reaction moves to the left. 5. **Red.** \( \text{H}^+ \) concentration decreases. Reaction moves to the left. 6. **Yellow.** \( \text{H}^+ \) concentration increases. Reaction moves to the right. 7. **Yellow.** \( \text{H}^+ \) concentration decreases. Reaction moves to the right. 8. **Red.** \( \text{H}^+ \) concentration increases. Reaction moves to the right. *(Selected Option)* ### Explanation: When \(\text{OH}^-\) is added to the solution, it reacts with \( \text{H}^+ \), reducing its concentration. This drives the reaction to the right, leading to the formation of more \(\text{MO}^-\), which is yellow. However, the selected correct option indicates that the reaction moving to the right will result in a red color, due to the increase in \( \text{H}^+ \) concentration, which is the equilibrium response to the initial decrease caused by \(\text{OH}^-\). This shows a misunderstanding or correction in the logical assumption, as the equilibriums aim to counter the added base effect by eventually forming more of the red acid form.
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