Q.

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 : 

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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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a

42 g

b

10.5 g

c

84 g

d

 

21 g

answer is C.

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Detailed Solution

Solubility: amount of can be dissolved in 100 ml of  H2O at given temperature solubility at  10°C KNO321gcan dissolve in 100 ml H2O , 50ml212=10.5g.

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