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DIY SOLUTIONS FOR YOUR HEALTH
How to dilute a solution

How to Dilute a Solution

 

To prepare N units of  a C2 % Concentration solution from  a C1 %  solution, you need:

 

N   x   C2 %

_____________    units of C1 % solution

C1 %

 

 

For required dilution:

 

Add calculated number of units of C1 %  solution to  (N minus calculated number ) oz. of water, for a total of  N units of  a C2 % solution

 

 

Special  note when diluting a violently reactive solution – Eg. hydrochloric acid, it is safer (contains somewhat violent reaction in a less full container)  to add half of the required water before adding the calculated number of required units of C1 %  solution, and then top up with the rest of the water, for a total of N units

 

 

Example 1:

 

To prepare N ( 8 oz.) of  C2 % (6 %)  hydrochloric acid from a  C1 %  (32%) hydrochloric acid solution, you need:

 

8   x   6 %

_____________    oz. of  32 % solution =  1.5 oz.

 32 %

 

 

You will be adding  1.5 oz. 32% hydrochloric acid to 6.5  (i.e.  8 - 1.5 ) oz. of water

                                    for a total 8  oz. of  6% solution of Hydrochloric acid

 

 

 

HOWEVER, since HCl acid produces a somewhat violent reaction with water, then first add 4 oz. water, then 1.5 oz. 32 % hydrochloric acid, then finally top up with 2.5  (i.e. 8 minus 4 minus 1.5 ) oz. water

 

Example 2:

 

Make 100 ml of a 3 % solution of hydrogen peroxide from 35% hydrogen peroxide:

 

You need:                                                    100   x   3 %

_____________    ml of  35 % solution =  ~  8.5 ml.

 35 %

 

Add  8.5 ml. 35 % hydrogen peroxide to 91.5  (i.e. 100 minus  8.5 ) ml. water for a total of 100 ml. of a 3 % solution of hydrogen peroxide