Question

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

Answer 1

Explanation:

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

2

×

5

=

250

units of water.

i.e. in each  

100

m

l

of  

5

%

acetic acid we should add  

150

m

l

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.