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Effect on Indicators by Acids and Bases

Name an indic...

Question

Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.

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Solution

Phenolphthalein is pink in alkaline solution but turns colourless in acidic solution.

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Q. name an indicator which is colorless in acid or neutral solution but turns deep blue color in basic solution

Q. Which indicator produces a pink colour in an alkaline solution?

Q. Phenolphthalein indicator is colourless in an acid and turns pink in an alkaline solution. When an aqueous solution of potassium iodide is electrolysed with phenolphthale in indicator, what colours appear at the electrodes?
Cathode:

2 H_{2} O_{(l)} + 2 e^{-} \to H_{(g)} + 2 O H^{-} (a q)

2 I_{(a q)}^{-} \to I_{2 (s)} + 2 e^{-}

Q. Which of the following indicator gives pink colour in an alkaline solution?

Q. Phenolphthalein is a colourless indicator that turns pink in basic solution.

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Effect on Indicators by Acids and Bases

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