Answer to Question #91133 in Organic Chemistry for S

Question

Determine if the solution is unsaturated, saturated or supersaturated:
i) 45g of KNO3 in 50g of water at 50°C
ii) 10g of NaCl in 50g of water at 25°C
iii) 80g of K2CR2O7 in 100g of water at 90°

Answer 1

Solubility of a sunstance is ratio of mass of subsatnce to 100 g of water

1) Solubility of KNO3 at 50⁰ C is 88 g per 100 g of water

we have a solution of KNO3: 45 g of KNO3 in 50 of water. Find mass of salt in 100 g of water:

45g - 50 g of water

x g - 100 g of water

x= 90 g

As 90 g >88 g then the solution supersaturated.

2) Solubility of NaCl at 25⁰C is 35 g per 100 g of water

We have a solution of NaCl: 10 g of NaCl in 50 g of water. Find mass of salt in 100 g of water:

10 g - 50 g of water

x g - 100 g of water

x =20

As 20 g <35 g, then the solution is unsaturated

3) Solubility of K2Cr2O7 at 90⁰C is 68 g per 100 g of water

We have a solution of K2Cr2O7: 80 g of K2Cr2O7 in 100 g of water.

As 80g > 68g, then the solution supersatureted