Question

1) 5g of KCI is dissolved in water and the solution is made up to 100 cm³. What is the molarity of the solution? (molar mass of KCI=74.6).​

Answer 1

Given:

Mass of KCl= 5g

Molar mass of KCI=74.6

Volume of solution = 100 cm³ = 0.1L

(1000 cm³= 1L)

To find:

Molarity of solution

Solution :

Molarity=

$\frac{no \: of \: moles \: of \: solute}{volume \: of \: solution}$

No. of moles if solute=

$\frac{given \: mass}{molar \: mass}$

=

$\frac{5}{74.6}$

Molarity =

$\frac{5}{74.6 \times 0.1}$

= 0.67M

Ans: Molarity of solution is 0.67M