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Standard XII
Chemistry
Reducing Nature of Alkali Metals
54 A 2g sampl...
Question
54 A 2g sample contain Na2CO3 & NaHCO3 losses 0.248g when heated to 300C at this temp sodium bicarbonate decomposes. What is the % of Na2CO3 in the given mixture
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Q.
A 2.00 g. of sample containing
N
a
2
C
O
3
and
N
a
H
C
O
3
loses 0.248 g when heated to
300
o
C
, the temperature at which
N
a
H
C
O
3
decomposes .Find % composition of
N
a
2
C
O
3
in the mixture ?
Q.
A
2.0
g sample containing
N
a
2
C
O
3
and
N
a
H
C
O
3
loses
0.248
g when heated to
300
o
C
, the temperature at which
N
a
H
C
O
3
decomposes to
N
a
2
C
O
3
,
C
O
2
and
H
2
O
. The
%
of
N
a
2
C
O
3
in the mixture is (as the nearest integer)
:
Q.
A 2 g sample containing
N
a
2
C
O
3
and
N
a
H
C
O
3
loses 0.62 g when heated to
300
o
C
,
the temperature at which
N
a
H
C
O
3
decomposes to
N
a
2
C
O
3
,
C
O
2
and
H
2
O
.
What is the percentage of
N
a
2
C
O
3
in the given mixture.
Q.
A sample contains a mixture of
N
a
H
C
O
3
and
N
a
2
C
O
3
.
H
C
l
is added to
15.0
g of the sample yielding
11.0
of
N
a
C
l
. What percent of the sample is
N
a
2
C
O
3
?
Reactions are:
N
a
2
C
O
3
+
2
H
C
l
→
2
N
a
C
l
+
C
O
2
+
H
2
O
N
a
H
C
O
3
+
H
C
l
→
N
a
C
l
+
C
O
2
+
H
2
O
Molecular weight of
N
a
C
l
,
N
a
H
C
O
3
and
N
a
2
C
O
3
is
58.5
,
84
and
106
g/mol respectively.
Q.
A
100
g
pure sample of
N
a
H
C
O
3
was heated until
11.2
L
of
C
O
2
(
g
)
was collected at
S
T
P
. What percentage of the
N
a
H
C
O
3
had decomposed?
N
a
H
C
O
3
(
s
)
→
N
a
2
C
O
3
(
s
)
+
H
2
O
+
C
O
2
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