Question

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Question is :-

Solubility of potassium nitrate at 313 k is 62 g . Which mass of potassium nitrate be needed to produce a saturated solution of KNO3 in 52 gram of water at 313 k ? What is the effect of change of temperature on the solubility of a salt ?

Answer 1

That is how I interpret your statement.

This is the maximum amount of solute that can be dissolved in water at 313K. The solution is saturated at that temperature.

If you have only 50g H2OP you will dissolve only half the mass of KNO3

Mass KNO3 = 62/2 = 31g . KNO3 soluble in 50g H2O at 313K.

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Answer 2

Solubility of potassium nitrate at  313K = 62/100

100 g of water contains potassium nitrate = 62 g

50 g of water contains potassium nitrate  = 62/100 X 50 = 31g

Thus, 31 g potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 g of water at 313 K.