A student determined the solubility of four substances, potassium nitrate, sodium chloride, potassium chloride and ammonium chloride in water at five different temperatures of $10 ° C, 20 ° C, 40 ° C, 60 ° C, and 80 ° C$ , and obtained the following data :
What mass of potassium nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at $10 ° C$ ?

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21 g

42 g

10.5 g

84 g

answer is C.

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Detailed Solution

Solubility: amount of can be dissolved in 100 ml of $H_{2} O$ at given temperature solubility at ${10°C KNO}_{3} \to 21 g$ can dissolve in 100 ml $H_{2} O$ , $50ml \to \frac{21}{2} = 10.5 g .$

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