Is Matter Around Us Pure (Concentration of Solution Numericals) Class 9 Important Questions

Q 1. What is solubility? 

Q 2. Define unsaturated and saturated solution. 

Q 3. A solution contains 16 g of urea in 120 g of the solution. Calculate mass by mass percentage. 

 Q 4. What mass of potassium chloride would be needed to form a saturated solution in 50 g of water at 313 K? (Given solubility of salt at 313 K is 40 g)

Q 5. 100 mL of alcohol has been dissolved in 400 mL of water. Calculate v/v%.

Q 6. A solution contains 60 g of common salt in 240 g of water. Calculate the concentration in terms of m/m % 

Q 7. It is desired to make 500 g of 10% mass by mass percentage of urea in water. What mass of urea and water is required?

Q 8. 36g of common salt is dissolved in 100 g of water at 396K to make a saturated solution. Find the concentration (mass by mass) of the solution at this temperature.

Q 9. Calculate the mass of copper sulphate and mass of water required to make 250g of 30% (mass by mass) solution of copper sulphate. 

Q 10. How would you prepare 500 mL of a 70% volume by volume aqueous solution of acetone?

Q 11. Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water? 

Q 12. What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 150 grams of water at 313 K if its solubility is 62g at 313K.