Ncert Exercises & Solutions

If 500 mL of a 5 M solution is diluted to 1500 mL, the molarity of the resultant solution is:

1. 1.5 M

2. 1.66 M

3. 0.017 M

4. 1.59 M

Hint: Dilution equation =

\underset{(Before}{M_{1} V_{1}}

dilution) = \underset{(After}{M_{2} V_{2}}

dilution)

Step 1:

Given values are as follows:

M_{1} = 5

M

V_{1} = 500

mL

V_{2} = 1500

mL

M_{2} = M

Step 2:

For dilution, a general formula is as follows:

\underset{(Before}{M_{1} V_{1}}

dilution) = \underset{(After}{M_{2} V_{2}}

dilution)

500 \times 5

M = 1500 \times M

M = \frac{5}{3} = 1.66

M