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Visual Indicators

Name an indic...

Question

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

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Solution

Phenolphthalein is a synthetic indicator and its neutral colour is ‘colourless’.

It changes to pink colour in alkaline solution but it remains colourless in acidic solution.

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Q. A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again?
(1) HCI solution
(2) NaOH solution
(3) NH₃ solution
(4) NaCI 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. name an indicator which is colorless in acid or neutral solution but turns deep blue color in basic solution

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

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