Problem: An indicator changes from red to blue going from its acidic (nonionized) form to its basic (ionized) form. The indicator has a Ka of 3.2 × 10−5 . What color would be visible in a solution with this indicator at pH 5.62?1. red2. purple3. blueish-purple4. reddish-purple5. blue 

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FREE Expert Solution

We’re being asked to determine the color of an indicator at pH 5.62

The indicator changes from red to blue when going from its acidic (nonionized) form to its basic (ionized) form.


HA (acidic form)  A (basic form); Ka = 3.2 × 10–5


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Problem Details

An indicator changes from red to blue going from its acidic (nonionized) form to its basic (ionized) form. The indicator has a Ka of 3.2 × 10−5 . What color would be visible in a solution with this indicator at pH 5.62?

1. red

2. purple

3. blueish-purple

4. reddish-purple

5. blue

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Acid Base Indicators concept. If you need more Acid Base Indicators practice, you can also practice Acid Base Indicators practice problems.

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Based on our data, we think this problem is relevant for Professor Abdaljalil's class at NMSU.