Question

The molarity of 2% W/V NaOH solution is.

a) 0.5 M b)0.05M c)0.25M d)0.1M

Answer 1

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Answer 2

Answer:

The molarity of NaOH solution will be equal to 0.5M.

Therefore, the option (a) is correct.

Explanation:

We have given,

The weight by volume percentage of NaOH solution = 2%

It means that 2g of sodium hydroxide is dissolved in 100ml of solution.

Therefore, the weight of sodium hydroxide = 2g

Volume of NaOH solution = 100ml = 0.1L

Molecular mass of sodium hydroxide = 23 + 16 +1 = 40g/mol

Number of moles of NaOH = 2/40 = 0.05moles

Molarity of the solution is calculated by dividing the number of moles of solute to volume of solution (in L).

Molarity of NaOH solution = Moles of NaOH /volume of solution (in L)

Molarity of NaOH solution $=\frac{0.05mol}{0.1L}=0.5M$

Therefore, the molarity of 2% W/V NaOH solution is equal to 0.5M.