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

N
x C_{2}
%

_____________units of
C_{1}_{ }%
solution

C_{1}_{
}%

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

Specialnote 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 aC_{1 }% (32%) hydrochloric acid solution, you
need:

8x
6
%

_____________oz. of 32_{
}% solution =1.5oz.

_{}32
%

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

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

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

Example 2:

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

You need:100x 3
%

_____________ml of 35_{
}% solution = ~8.5ml.

_{}35
%

Add8.5ml. 35 % hydrogen peroxide to
91.5(i.e.
100
minus8.5 )ml. water for a total of
100 ml. of a3 % solution of hydrogen peroxide

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