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Class 11 NEET Chemistry Some Basic Concepts Of Chemistry
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© examsnet.com
Question : 27
Total: 60
25.3 g of sodium carbonate
N
a
2
C
O
3
is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion,
N
a
+
and carbonate ions,
C
O
3
2
−
are respectively
(Molar mass of
N
a
2
C
O
3
=
106
g
mol
−
1
)
(2010)
0.955 M and 1.910 M
1.910 M and 0.955 M
1.90 M and 1.910 M
0.477 and 0.477 M
Validate
Solution:
Given that molar mass of
N
a
2
C
O
3
=
106
g
∴ Molarity of solution
−
2.53
×
1000
106
×
250
=
−
0.955
M
N
a
2
C
O
3
–
–
–
–
–
–
–
–
>
2
N
a
+
+
C
O
3
2
−
[
N
a
+
]
−
2
[
N
a
2
C
O
3
]
−
2
×
0.955
−
1.910
M
[
C
O
3
2
−
]
−
[
N
a
2
C
O
3
]
−
0.955
M
© examsnet.com
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