Problem: Two drops of indicator HIn (K a = 1.0 x 10 -9), where HIn is yellow and In- is blue, are placed in 100.0 mL of 0.10 M HCl. b. The solution is titrated with 0.10 M NaOH. At what pH will the color change (yellow to greenish yellow) occur?

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We’re being asked to determine at what pH will the color change (yellow to greenish yellow) occur


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


HIn (acidic form)  A (basic form); Ka = 1.0× 10–9


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Problem Details

Two drops of indicator HIn (K a = 1.0 x 10 -9), where HIn is yellow and In- is blue, are placed in 100.0 mL of 0.10 M HCl. 

b. The solution is titrated with 0.10 M NaOH. At what pH will the color change (yellow to greenish yellow) occur?

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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 Wittenberg's class at LEHIGH.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.