Illustration 1: When a mixture of NaBr and NaCl is repeatedly digested with H,SO, all the halogens
are expelled and Na, So, is formed quantitatively. With a particular mixture, it was found
that the weight of Na2SO4 obtained was precisely the same as the weight of Neer-
mixture taken. Calculate the ratio of the weights of NaCl and NaBr in the mixture
are expelled and Na, So, is formed quantitatively. With a particular mixture, it was found
that the weight of Na2SO4 obtained was precisely the same as the weight of Neer-
mixture taken. Calculate the ratio of the weights of NaCl and NaBr in the mixture
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Answer:
NaBr
H
2
SO
4
Na
2
SO
4
a g
NaCl
H
2
SO
4
Na
2
SO
4
b g
∴ Meq. of NaBr+ Meq. of NaCl = Meq. of Na
2
SO
4
Meq. of Na
2
SO
4
formed =
103
a
×1000+
58.5
b
×1000 =9.71a+17.09b
2
142
w
×1000=9.71a+17.09
w=
2000
142
[9.71a+17.09b]
Also,
mass of NaCl + mass of NaBr = mass of Na
2
SO
4
formed
a+b=
2000
142
[9.71a+17.09b]
b
a
=
621.18
426.78
=0.687
Ratio of
NaBr
NaCl
=
a
b
=
1
1.455
So, the ratio as nearest integer is 1