Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is __________ * 10^-1 M. (Nearest integer)

[Atomic mass : Na = 23.0, O = 16.0, H = 1.0]

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Vishal Baghel | Contributor-Level 10

6 months ago

$N a_{2} O + H_{2} O \to 2 N a O H$

w = 20 g

$V_{H_{2} O} = 500 m L$

Mole of Na₂O= $\frac{20}{62}$

$?$ 1 mole of Na₂O gives 2 mole of NaOH

$∴ (\frac{20}{62})$ mole of Na₂O gives $(2 * \frac{20}{62})$ moles of NaOH

$= \frac{20}{31} m o l e$

Molarity of NaOH solution

$= \frac{\frac{20}{31} * 100}{500} M = \frac{20}{31} * 2 M = \frac{40}{31} M$

= 1.29 M

= $12.9 * 1 0^{- 1} M \approx 13 * 1 0^{- 1} M$

Ans. = 13

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Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is __________ * 10-1 M. (Nearest integer) [Atomic mass : Na = 23.0, O = 16.0, H = 1.0]

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