Mole ConceptHard
Question
25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ion,CO32- are respectively
(Molar mass of Na2CO3 = 106 g mol-1)
(Molar mass of Na2CO3 = 106 g mol-1)
Options
A.0.955 M and 1.910 M
B.1.910 M and 0.955 M
C.1.90 M and 1.910 M
D.0.477 M and 0.477 M
Solution
Molarity = 
× 1000
=
= .9547 
0.955 M
Na2CO3 in aqueous solution remains dissociated as
Na2CO3 ⇋ 2Na+ + CO32-
x 2x x
Since. the molarity of Na2CO3 is 0.955 M, the molarity of CO32- is also 0.95 M and that of Na+ is 2 × 0.955 = 1.910 M
× 1000=
= .9547 0.955 MNa2CO3 in aqueous solution remains dissociated as
Na2CO3 ⇋ 2Na+ + CO32-
x 2x x
Since. the molarity of Na2CO3 is 0.955 M, the molarity of CO32- is also 0.95 M and that of Na+ is 2 × 0.955 = 1.910 M
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