An empty evaporating dish weighs 20.0g. After adding saturated solution of $N a N O_{3}$ , the dish weighs 66.0g. When evaporated to dryness the dish with crystals weighs 41.5g. Find the solubility of $N a N O_{3}$ at $20^{0} C$ .

84.9 g

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87.7 g

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90.8 g

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83.25 g

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Solution

The correct option is B
87.7 g

Weight of saturated solution of $N a N O_{3}$ = (66.0 – 20.0) g = 46.0g

Weight of crystals of $N a N O_{3}$ = (41.5 - 20.0) g = 21.5g

Weight of water in saturated solution = (46.0 - 21.5) g = 24.5g

Solubility of $N a N O_{3}$ = $\frac{W e i g h t o f N a N O_{3} c r y s t a l}{W e i g h t o f w a t e r} \times 100$

$= \frac{21.5}{24.5} \times 100 \Rightarrow 87.7 g$

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An empty evaporating dish weighs 20.0g. After adding saturated solution of NaNO3, the dish weighs 66.0g. When evaporated to dryness the dish with crystals weighs 41.5g. Find the solubility of NaNO3 at 200C.

An empty evaporating dish weighs 20.0g. After adding saturated solution of $N a N O_{3}$ , the dish weighs 66.0g. When evaporated to dryness the dish with crystals weighs 41.5g. Find the solubility of $N a N O_{3}$ at $20^{0} C$ .