Phenolphthalein is an acid-base indicator. What color does phenolphthalein appear in a basic (alkaline) solution?

Referring to the table below, select an indicator for use in the titration of C6H5NH2 (pKb=9.41) with a strong acid. Which indicator would be most appropriate?

Based on the titration curves of a 1 M solution of a weak acid with a strong base and a 1 M solution of a strong acid with the same base, what is the estimated pKa of the weak acid?

Given the following data: Volume of HA used = 9.19 mL, Volume of NaOH at equivalence point = 8.42 mL, pH at equivalence point = 8.66, and Concentration of NaOH = 0.1471 M, what is the pKa of the acid HA?

Which acid-base indicator is yellow in a solution with a pH of 9.8?

Bromothymol blue is an acid-base indicator that changes color over a certain pH range. At approximately which pH value would bromothymol blue appear blue?

Bromothymol blue is an acid-base indicator that changes color over a specific pH range. In which pH condition does bromothymol blue appear yellow?

In an acid-base test using litmus paper, what color does blue litmus indicate when the solution is basic?