Sodium oxide reacts with water to produce sodium hydroxide. $20 . 0g$ of sodium oxide is dissolved in $500mL$ of water. Neglecting the change in volume, the concentration of the resulting $NaOH$ solution is _________ $\times {10}^{- 1}M .$ (Nearest integer)
[Atomic mass : $Na = 23 . 0, O = 16 . 0, H = 1 . 0$ ]

Question

Sodium oxide reacts with water to produce sodium hydroxide.

20 . 0g

of sodium oxide is dissolved in

500mL

of water. Neglecting the change in volume, the concentration of the resulting

NaOH

solution is _________

\times {10}^{- 1}M .

(Nearest integer)
[Atomic mass :

Na = 23 . 0, O = 16 . 0, H = 1 . 0

]

Quantrex Academy · Accepted Answer

Correct answer: 0

Na _ 2 O + H _ 2 O → 2NaOH According to reaction (20)/(62) mole of Na _ 2 O gives (40)/(62) mole of NaOH so molarity of NaOH solution is = n _ NaOH V _ ml × 1000 = (40)/(62) × (1000)/(500) = (80)/(62) = 1 . 29M 1 . 3M

Sodium oxide reacts with water to produce sodium hydroxide. 20 . 0g...

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