To prepare Nunits of a
C_{2}% Concentration solution from
a C_{1}_{ }%
solution, you need:

N
x C_{2}% /
C_{1}%
units of
C_{1}_{ }%
solution

For
required dilution: Add calculated number of
units of
C_{1}_{
}% solution to
(N
minuscalculated number) oz.
of water, for a total of N
units of a
C_{2}% 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 requiredwater before adding the
calculated number of required
units of
C_{1}_{ }%
solution, and then top up with the
rest of the water, for a total of
Nunits

Example 1:

To prepare
N ( 8 oz.) of C_{2}
% (6 %) hydrochloric
acid from a C_{1 }% (32%) hydrochloric acid solution, you
need:

8 x
6 % /
32% oz. = 1.5oz. of
32_{
}%solution

You will be adding 1.5oz.32% hydrochloric acid to
6.5oz.
(i.e.
8- 1.5oz.
)
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 4oz.
water, then 1.5oz. 32
% hydrochloric acid, then finally top up with
2.5(i.e.
8minus 4minus 1.5) oz.
water

Example 2:

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

You need: 100x 3 % / 35
% ml of 35_{
}% solution = ~8.5ml.

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

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