Question

I. ANSWER THE FOLLOWING QUESTIONS
1. A solution is made by dissolving 50g of potassium nitrate in 250g of water. Calculate the concentration of potassium nitrate solution.
2. 200g of common salt is dissolved in 800g of water so as to make its solution. Calculate the concentration of common salt solution.
3. How water should be added to 50g of lead nitrate crystals, so as to obtain 10% solution?
4. A solution of acetone contains 20g of acetone in 500 ml of water. Calculate the concentration of the solution.
5. A solution of alcohol in water contains 250g of alcohol and 500 ml of water. Calculate the concentration of the alcohol solution.
6. How can you change a saturated solution to an unsaturated solution without adding any more solvent to it?
7. Based on which factor a solution is said to be diluted, concentrated or saturated?
8. Identify solute and solvent in 'tincture of iodine'.
9. Why is water called universal solvent?
10. Why is it not possible to distinguish particles of a solute from the solvent in solution?​

Answer 1

Answer:

solution of alcohol in water contains 250g of alcohol and 500 ml of water. Calculate the concentration of the alcohol solution.

6. How can you change a saturated solution to an unsaturated solution without adding any more solvent to it?

7. Based on which factor a solution is said to be diluted, concentrated or saturated?

8. Identify solute and solvent in 'tincture of iodine'.

9. Why is water called universal solvent?

10. Why is it not possible to distinguish particles of a solute from the solvent

Answer 2

1.The concentration of potassium nitrate solution is equal to 16.67%. Explanation: The amount of potassium nitrate which is present in the solution is 50 gram and the total amount of solution is equal to 250 grams.28-May-2020

2 . Formula to calculate concentration is =

Mass of solute/Mass of solution ×100

200/800+200×100

200/1000×100

115×100

20%

3.450g of water needed to make 10%of lead nitrate crystal in solution.

4 . Mass of solute = 20g

Mass of solvent = 500

Mass of solution = 500+20=520

Concentration = 20/520×100

100/20=3.85