Question

20mL of 6%(W/V) urea solution is diluted with water such that final volume of solution is 1L.The molarity of final solution is?

Answer 1

0.02 M is the molarity of the final solution.

Explanation:

Molarity is described as the congregation of a particular substance in a given solution. It is denoted in the form of the number of moles of solute in every litre of solution.

As per the question,

Given that,

6%(w/v) = 6gm urea is present in 100 ml of the solution.

so, 60 gm urea would be present in 1000 ml solution.

Now,

6/60 = 1/10

∵ 0.1 mole of urea is present in every 100 ml solution and 1 mole in 1 litre of solution.

Thus, Molarity or $M_{1}$ = 0.1/0.1 = 1 M

To find the molarity of the final solution,

$M_{1}$ = 1 M

$V_{1}$ = 20 ml

$V_{2}$ = 1000 ml or 1 litre

Using the formula,

$M_{1} V_{1} = M_{2} V_{2}$

1 * 20 = $M_{2}$ * 1000 ml

$M_{2}$ = 0.02 M

Therefore, 0.02 M is the molarity of the final solution.

Learn more: Molarity of the solution

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