Question

If 2gram of NaOH is present in 200 ml of its solution it's molarity will be

Answer 1

Answer:

Molarity = 0.25 M

Explanation:

Given

mass of NaOH = 2 g

Volume = 200ml ⇒ 0.2 L

Molarity = ??

Solution

Molarity = moles / volume in liters----------1

moles = given mass/ molar mass-------------2

moles = 2/ 40

moles = 0.05 mol

putting values in eq 1

Molarity = 0.05/0.2

Molarity = 0.25 M