Question

A certain indicator, HA, has a Ka, value of 1.0 x 10-7. The protonated form of the indicator is red and the ionized form is blue. 

What is the pK, of the indicator? 

What is the color of this indicator in a solution with pH=5.

The half-equivalence point of a titration occurs half way to the equivalence point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.

If 0.480 moles of a monoprotic weak acid (K, = 8.3 x 10 ) is titrated with NaOH, what is the pH of the solution at the half-equivalence point?

Answer 1