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Effect on Indicators by Acids and Bases

name an indic...

Question

name an indicator which is red in acid solution but turns blue in basic solution

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Solution

We know that acids turn blue litmus red while bases turn red litmus paper blue. So, if an indicator remains red in acidic solution but changes to blue in basic solutions, it is red litmus.

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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. Litmus turns red in an acidic solution and blue in a basic solution.

Q. An indicator which changes its colour from blue to red in acids is litmus solution.

Q. A certain acid-base indicator is red in acid solution and blue in basic solution. At

p H = 5,

75% of the indicator is present in the solution in its blue form. Calculate the pH at which the indicator shows 90% red form?

10^{4.523} = 3 \times 10^{- 5}

Q58) Consider the following statements about acid-base indicators.

i) Phenolphthalein gives a pink colour if the solution is acidic.

ii) China rose indicator turns acidic solutions to dark pink.

iii) Blue litmus turns red for a basic solution.

Which of the above statements are true?

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Effect on Indicators by Acids and Bases

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