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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

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