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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

Respuesta :

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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