Solubility of potassium nitrate at 313 K is 62 g. What mass of potassium nitrate would be needed to produce a saturated solution of KNO3 in 50 g of water at 313 K ? What is the effect of change of temperature on the solubility of a salt ?

a)Since 62 g of potassium nitrate is dissolved in 100g of water to prepare a saturated solution at 313 K, 31 g of potassium nitrate(KNO3) should be dissolved in 50 g of water to prepare a saturated solution at 313 K.

i.e the mass of potassium nitrate needed to make a saturated solution with 50gm of water = (62/100)*50=31

b)The solubility of a salt increases with temperature.

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