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14 March, 12:15

At 20°C, a saturated solution of sodium nitrate (NaNO3) contains 86 grams of solute in 100 m of waer How many grams of sodium nitrate must be added to saturate the solution at 50°C? 15 grams 29 grams 42 grams 115 grams

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  1. 14 March, 15:09
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    Answer;

    29 grams

    Explanation;

    At 20°C, a saturated solution of sodium nitrate (NaNO3) contains 86 grams of solute in 100 m of water.

    This means the solubility of NaNO3 at 20°C is 86 g/100 ml of water

    The solubility of NaNO3 at 50 °C is 115 grams of NaNO3/100 ml of water.

    Therefore; to get the amount of sodium nitrate must be added to saturate the solution at 50°C;

    We subtract the solubility at 20°C from the solubility at 50 °C

    That is; 115 g/100 ml of water - 86 g/100 ml of water

    = 29 grams of NaNO3
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