Find the equivalent weight of calcium hydroxide?
$(C a = 40, O = 16, H = 1)$

23 u

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37 u

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32 u

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56 u

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Solution

The correct option is A 37 u
The molecular formula of calcium hydroxide is $= C a (O H)_{2}$ .
Its molecular mass is $= 40 + (16 + 1) \times 2 = 40 + 17 \times 2 = 74 u$
The expression for the equivalent weight of $C a (O H)_{2}$ is as given below.
Equivalent weight $= \frac{Molecular mass}{No. of replaceable OH groups}$
Calcium hydroxide contains two replaceable OH groups
Substitute values in the above expression.
Equivalent weight $= \frac{74 u}{2} = 37 u$

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(K = 39, O = 16, H = 1)

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C a (O H)_{2} + H_{3} P O_{4} \to C a H P O_{4} + 2 H_{2} O

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