For an acid-base indicator,the dissociation constant $K_a = 1.0 \times 10^{-5}$. The indicator is red in acidic form and blue in basic form. What is the $pH$ range required for the color change from $80\%$ red to $80\%$ blue?

In an acid-base titration,the rapid change in $pH$ near the equivalence point depends on the indicator used. The $pH$ of the solution is related to the ratio of the concentrations of the conjugate acid $(HIn)$ and base $(In^-)$ forms of the indicator by which equation?

Phenolphthalein is not a good indicator for titrating:

Which indicator is used for the titration of a weak acid (oxalic acid) and a strong base (caustic soda)?

The pink color of phenolphthalein in an alkaline medium is due to:

Methyl orange is an indicator in acid-alkali titration. It gives