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Arrehenius Theory of Acids and Bases

The pH of a...

Question

The $p H$ of a $0.1 M$ solution of weak base is $11$ . On diluting the solution:

p H

increase

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[O H^{-}]

increase

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α

decrease

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p H

decrease

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Solution

The correct option is D $p H$ decrease
Diluting an alkaline solution decreases the concentration of OH^-(aq) ions. This causes the pH to decrease towards 7.
Diluting an alkali by adding more water decreases the pH of the solution towards 7 making it less alkaline.

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Similar questions

What should be added to

(a) increase the $p^{H}$ value,

(b) decrease the $p^{H}$ value of a neutral solution

N H_{4} O H

N H_{4} O H (a q) ⇌ N H_{4}^{+} (a q) + O H^{-} (a q)

N H_{4} C l

p H

N H_{4} O H

p H

p H

C H_{3} C O O H

C H_{3} C O O H

p H

[H^{+}]

α

α

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