Question

a solution of NaOH is prepared by dissolving 4g of it in 200cm3 of the solution. calculate the molarity of the solution

Answer 1

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Answer 2

Given:

Mass of NaOH given = 4g

The volume of the solution = 200cm³ = 0.2 dm³ or litre

To Find:

Molarity of the solution

Solution:

The formulae for calculating the Molarity of the solution is given as follows

$molarity = \frac{number \: of \: moles}{volume \: of \: the \: solution.} = \frac{n}{v}$

Now, for calculating the number of moles for NaOH solution, the formula used is,

$n = \frac{mass \: of \: solute}{molecular \: weight}$

Now, putting the values we get,

$n = \frac{4}{40} = 0.1 \: moles$

Thus, the molarity is,

$molarity = \frac{0.1}{0.2} =0 .5$

Hence, the molarity of the solution is 0.5 M