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25.3 g of sodium carbonate, Na2CO3 is di...

25.3 g of sodium carbonate, `Na_2CO_3` is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, `Na^(+)` and carbonate ions, `CO_(3)^(2-)` are respectively (Molar mass of `Na_2 CO_3 = 106 g mol^(-1)`)

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

Text Solution

Verified by Experts

The correct Answer is:
B
Given that molar mass of ` Na_2 CO_3 = 106 g`
` therefore ` Molarity of solution ` = ( 25.3 xx 1000)/(106 xx 250 ) = 0.955 M`
` Na_2 CO_3 to 2 Na^(+) +CO_(3)^(2-)`
` [Na^(+)]=2[ Na_2 CO_3 = 2 xx 0.955 = 1.910 M`
` [CO_(3)^(2-)] = [Na_2 CO_3 ]=0.955 M`
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