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Byju's Answer

Standard XII

Chemistry

Charles' Law

In the labora...

Question

In the laboratory, $20.0$ $m l$ of an aqueous solution of calcium hydroxide, $C a (O H)_{2}$ , was used in a titration. A drop of phenolphthalein was added to it to indicate the end point. The solution turned colorless after $20.0$ $m l$ of a standard solution of $0.050$ M $H C l$ solution was added. The molarity of the $C a (O H)_{2}$ taken is:

0.010

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0.025

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0.50

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0.75

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1.0

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Solution

The correct option is A $0.025$ M
Since $n f \times M_{1} V_{1} = M_{2} V_{2}$ (Neutralization reaction)
$2 \times 20 \times M = 0.05 \times 20 \times 1$
$∴ M = \frac{0.05}{2} = 0.025 M$

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The correct option is A 0.025MSince nf×M1V1=M2V2 (Neutralization reaction)2×20×M=0.05×20×1∴M=0.052=0.025M

The correct option is A $0.025$ M
Since $n f \times M_{1} V_{1} = M_{2} V_{2}$ (Neutralization reaction)
$2 \times 20 \times M = 0.05 \times 20 \times 1$
$∴ M = \frac{0.05}{2} = 0.025 M$