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Question

Chemistry Question on Solutions

200mL200\, mL of water is added to a 500mL500\, mL of 0.2M0.2 \,M solution. What is the molarity of this diluted solution?

A

0.5010M0.5010\, M

B

0.2897M0.2897\, M

C

0.7093M0.7093 \,M

D

0.1428M0.1428\, M

Answer

0.1428M0.1428\, M

Explanation

Solution

Thecorrect option is( D): 0.1428 M.

0.2 molar solution, ie, 1000 mL solution contains 0.2 mol solute.
\therefore 500 mL solution contains 0.1 mol solute thus, 700 mL solution contain
0.1500×700=0.1428 mol\frac{0.1}{500}\times 700=0.1428\text{ }mol
\therefore Molarity of solution =0.1428 M.