How much water should we add to prepare $2%$ acetic acid from $5%$ acetic acid?

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Answer 1 · 2017-04-10T06:44:34

To prepare 2% acetic acid from $5%$ acetic acid, we must add one and a half times water.

$5%$ acetic acid contains

$5$ units of acetic acid in $100$ units of water

for $2%$ of acetic acid we need

$2$ units of acetic acid in $100$ units of water

or $5$ units of acetic acid in $100/2xx5=250$ units of water.

i.e. in each $100ml$ of $5%$ acetic acid we should add $150ml$ of water i.e. one and a half times water

Hence, to prepare 2% acetic acid from $5%$ acetic acid, we must add one and a half times water.

How much water should we add to prepare 2%2% acetic acid from 5%5% acetic acid?