# Problem: Pyradine (C6H5N) is a weak organic base with a K b of 1.7x10-9. Suppose you were to titrate 25.0 mL of a 0.100 M aqueous solution of pyridine with a 0.100 M HCl solution. a. What is the pH at the equivalence point?b. The Ka of the acid-base indicator 2,3-dinitrophenol is around 6.69 x 10 -5, and the Ka of the acid-base indicator thymolphthalein is approximately 1.26x10-10. If you had to choose between these two indicators for your titration above, which would you choose?

98% (59 ratings)
###### Problem Details

Pyradine (C6H5N) is a weak organic base with a K b of 1.7x10-9. Suppose you were to titrate 25.0 mL of a 0.100 M aqueous solution of pyridine with a 0.100 M HCl solution.

a. What is the pH at the equivalence point?

b. The Ka of the acid-base indicator 2,3-dinitrophenol is around 6.69 x 10 -5, and the Ka of the acid-base indicator thymolphthalein is approximately 1.26x10-10. If you had to choose between these two indicators for your titration above, which would you choose?

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 is the difficulty of this problem?

Our tutors rated the difficulty ofPyradine (C6H5N) is a weak organic base with a K b of 1.7x10...as high difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Jules took 10 minutes and 32 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

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