Question

4 g of NaOH is dissolved in 500 g of water. The concentration of solution will be
(a) 8 g/L
(b) 0.2.N.
(C) 0.2 m
(d) 0.2 M

Answer 1

Answer:

c) 0.2 (M)

Explanation:

4 g NaOH = 4/40 mol NaOH = 0.1 mol NaOH

the volume of the solution is = 500 mL = 500/1000 L = 0.5 L

hence the molarity = no of moles of solute / volume of solution

                               =     0.1 / 0.5 (M)

                               =       1 / 5   (M)

                               =         0.2 (M)