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An empty evaporating dish weighs 20.0 g....

An empty evaporating dish weighs 20.0 g. After adding saturated solution of `NaNO_3`, the dish weighs 66.0 g. When evaporated to dryness, the dish with crystals weighs 41.5 g. Find the solubility of `NaNO_3`, at `20^@ C`.

Text Solution

Verified by Experts

Weight of saturated solution of `NaNO_3 = (66.0 – 20.0) g = 46.0 g`
Weight of crystals of` NaNO_3` = (41.5 – 20.0) g = 21.5 g
Weight of water in saturated solution = (46.0 – 21.5) g = 24.5 g
Solubility of `NaNO_3 = ("weight of" NaNO_3"Crystals")/("weight of water ") xx 100`
`=(21.5 )/( 24.5 ) xx 100 =87.7 g `
Solubility of `NaNO_3 ` at `20^@ ` C is = 87.7 in 100 g `H_2 O`
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