Question

15. If 25g of copper sulphate salt is dissolved in 100g of water to make a solution, find mass by mass
concentration of the solution.
16. Define the following terms-
3
(i) saturated solution
(ii) unsaturated solution
(iii) solubility of solute.​

Answer 1

ANSWER:

• Mass by mass concentration of the solution = 20 %.

GIVEN:

• 25g of Copper Sulphate salt is dissolved in 100g of water to make a solution.

TO FIND:

• Mass by mass concentration of the solution.

EXPLANATION:

$\bigstar\ \boxed{\bold{\large{\pink{Mass\ \% = \dfrac{Mass \ of \ solute}{Mass\ of\ solution} \times 100}}}}$

$\implies \sf Mass \ of \ solute = 25\ g$

$\implies \sf Mass \ of \ solution= 100+25=125\ g$

$\sf \leadsto Mass\ \% = \dfrac{25}{125} \times 100 \ \%$

$\sf \leadsto Mass\ \% = \dfrac{1}{5} \times 100 \ \%$

$\sf \leadsto Mass\ \% = 20 \ \%$

Concentration = 20 % by mass.

SATURATED SOLUTION:

• The solution in which no more solute can be added at a given temperature is called saturated solution.

• Eg. 36 g of NaCl in 100g of water at room temperature.

UNSATURATED SOLUTION:

• The solution in which some more solute can be added at a given temperature is called unsaturated solution.

• Eg. 5 g of NaCl in 100g of water.

SOLUBILITY:

• Solubility of a solute in a particular solvent at a given temperature is defined as the number of grams of solute necessary to saturate 100 grams of solvent at that temperature.

• Solubility of CuSO₄ in H₂O is 20.7 g at 20° C.

Answer 2

Answer:

well done

Explanation: