The formula and molecular mass of caustic soda is :

N a O H = 40 g m o l^{- 1}

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N a_{2} O H = 63 g m o l^{- 1}

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N a (O H)_{2} = 57 g m o l^{- 1}

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none of the above

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Solution

The correct option is A $N a O H = 40 g m o l^{- 1}$
Sodium has valency $+ 1$ and is represented as $N a,$ and hydroxyl has a valency of $- 1$ and is represented as $O H^{-}$ . Caustic soda is $N a O H .$ Molar mass = $23 + 16 + 1 = 40 g m o l^{- 1}$ .

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Question 47
Write the formulae for the following and calculate the molecular mass for each one of them

(a) Caustic potash

(b) Baking powder

(d) Caustic soda

(e) Ethanol

N a O H

40 g {m o l}^{- 1})

1.6 g

N a O H

500 c m^{3}

N a O H

4.0

N a O H

N a O H

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