The $p H$ of a solution of sodium hydroxide is 9. What will be its $p H$ when this solution is diluted?

Less than 9

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More than 9

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Equal to 9

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Equal to 10

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Solution

The correct option is A Less than 9
The $p H$ of a solution of sodium hydroxide is $9$ .

Its $p H$ will be less than $9$ when this solution is diluted.

On dilution, the $p H$ decreases as hydroxide ion concentration decreases and hydrogen ion concentration increases.

Option A is correct.

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Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Q. The pH of a 0.001 M aqueous solution of sodium hydroxide will be:

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The pH of a solution of sodium hydroxide is 9. What will be its pH when this solution is diluted?

The correct option is A Less than 9The pH of a solution of sodium hydroxide is 9.Its pH will be less than 9 when this solution is diluted. On dilution, the pH decreases as hydroxide ion concentration decreases and hydrogen ion concentration increases.Option A is correct.

The $p H$ of a solution of sodium hydroxide is 9. What will be its $p H$ when this solution is diluted?

The correct option is A Less than 9
The $p H$ of a solution of sodium hydroxide is $9$ .

Its $p H$ will be less than $9$ when this solution is diluted.

On dilution, the $p H$ decreases as hydroxide ion concentration decreases and hydrogen ion concentration increases.

Option A is correct.