CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases
Problem
An acid type indicator. HIn differs in colour from its conjugate base ( In− ). The human eye is sensitive to colour differences only when the ratio [In−]/[HIn] is greater than 10 or smaller than 0.1. What should be the minimum change in the pH of the solution to observe a complete colour change ( Ka=1.0×10−5 )? (IIT 1997)