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Standard XII
Chemistry
Normality
a sample of p...
Question
a sample of pure calcium weighting 1.35 g was quantitatively converted to 1.86 g of pure CaO.atomic mass of calcium i
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Q.
A sample of pure calcium weighing
1.35
g was quantitatively converted to
1.88
g of pure calcium oxide.
The atomic mass of calcium would be:
Q.
Calcium and magnesium ion form a
10
5
L sample of hard water was quantitatively precipitated as carbonates and weight of precipitate obtained was found to be 568 g. On strong heating 264 g of weight is lost. The molarity of the
C
a
2
+
ions in hard water is
x
×
10
−
5
M. Find x
Q.
A
10.0
g
sample of a mixture of calcium chloride and sodium chloride is treated with a
N
a
2
C
O
3
solution. This calcium carbonate is heated to convert all the calcium to calcium oxide and the final mass of the calcium oxide is
1.62
g
. The percentage by mass of calcium chloride in the original mixture is:
Q.
Calculate the percentage of carbon in a 55 % pure sample of calcium carbonate.
(
C
a
=
40
,
C
=
12
,
O
=
16
)
Q.
A
10.0
g
a sample of a mixture of calcium chloride and sodium chloride is treated with
N
a
2
C
O
3
to precipitate the calcium as calcium carbonate. This
C
a
C
O
3
is heated to convert all the calcium to
C
a
O
and the final mass of
C
a
O
is
1.62
g
m
s
. The
%
by mass of
C
a
C
l
2
in the original mixture is :
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