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14 July, 10:03

How many grams of NaNO3 will precipitate if a saturated solution of NaNO3 in 200 g of water at 50°C is cooled to 20oC? Assume the following solubility values for NaNO3: 114.0g/100g H2O at 50oC; 88.0g/100g H2O at 20oC

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  1. 14 July, 11:59
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    Sodium nitrate is less soluble in cool water than warm. 144.0 grams are dissolved at 50°C, multiplying by 2 since there are 200 grams H2O = 72.0 grams. Then 88.0 grams are dissolved at 20°C, again multiplying by 2 = 44.0 grams. Subtracting both we get the final value that 28.0 grams precipitate from the saturated solution.
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