Question

Mass of NaOH that must be added to water to prepare 500 mL of 2 M aqueous solution is ?​

Answer 1

Answer:

40gm

Explanation:

Molarity (M) : The number of moles of a solute dissolved in 1 L (1000 ml) of the solution is known as the molarity of the solution.

Molarity of a solution

(M) = moles of solute (n) / Vol. of solution(ltr)

2 = n/0.5

n = 1

and moles(n) = given mass(m) / molar mass

n = 1 = m/40

so w=40gm.

Amount of sodium hydroxide present in 500ml of 2M solutions is 40 gm.