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JAMB Chemistry 2018 Paper

Question : 46

Total: 87

^{3}

Solution:

Concept:

Dilution keeps the amount of solute unchanged, so the product of concentration and volume stays constant.

Explanation:

Use the dilution formula:

C_{1}V_{1} = C_{2}V_{2}

Where:

C_{1} = 0.60\,M

(initial concentration)

V_{1} = 300\,cm^{3}

(initial volume)

C_{2} = 0.40\,M

(final concentration)

V_{2}

= final volume required

Make

V_{2}

the subject:

V_{2} = \frac{C_{1}V_{1}}{C_{2}}

Substitute the values:

V_{2} = \frac{0.60 \times 300}{0.40}

V_{2} = \frac{180}{0.40} = 450\,cm^{3}

So the solution must be diluted to

450\,cm^{3}

Answer:

450\,cm^{3}

(Option A).

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