what is the use of 1.2 % NA CL solutions
Answers
Explanation:
The thing to remember about dilution calculations is that the dilution factor,
DF
, can be calculated by taking
The ratio that exists between the concentration of the stock solution and the concentration of the diluted solution
The ratio that exists between the volume of the diluted solution and the volume of the stock solution
So for any dilution, you have
DF
=
concentration ratio: stock/diluted
c
stock
c
diluted
=
volume ratio: diluted/stock
V
diluted
V
stock
In your case, the dilution factor is equal to
DF
=
1.2
M
0.12
M
=
10
This tells you that the volume of the diluted solution is
10
times the volume of the stock solution.
You can thus say that you have
V
stock
=
V
diluted
DF
which, in your case, will get you
V
stock
=
1 L
10
=
0.1 L
−−−−−
The answer is rounded to one significant figure.
So, in order to perform this dilution, you take
0.1 L
of a
1.2-M
stock solution of sodium chloride and add enough water to get the final volume of the solution to
1 L
.
This will decrease the concentration of sodium chloride from
1.2 M
in the stock solution to
0.12 M
in the diluted solution.