What do indicators do

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All indicators are weak acids. An acid-base conjugate pair has different colors. Any indicator changes color when the pH of its solution is 7. There may be other reasons too. Do colors indicate how good or bad they taste? Answer d. Color change is a requirement for indicators. Answer No! Bromothymol blue has a p K n value of 7. At pH 7, its color changes from yellow to blue. Some indicators change color at pH other than 7.

Litmus Litmus indicator solution turns red in acidic solutions, blue in alkaline solutions, and purple in neutral solutions. Acids turn blue litmus paper red. Alkalis turn red litmus paper blue. Stays red. Indicator Range At a low pH, a weak acid indicator is almost entirely in the HIn form, the colour of which predominates.

As the pH increases - the intensity of the colour of HIn decreases and the equilibrium is pushed to the right.