Problem: Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form.If 0.120 M NaOH is slowly added to the HCl sample, in what pH range will the indicator change color?

🤓 Based on our data, we think this question is relevant for Professor Rowntree's class at University of Guelph.

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Acid-base indicators weak acids and weak bases

differ in the color of the solution depending on the pH of the environment.


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Problem Details

Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form.

If 0.120 M NaOH is slowly added to the HCl sample, in what pH range will the indicator change color?

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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.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Rowntree's class at University of Guelph.