`25.3 g` sodium carbonate, `Na_(2)CO_(3)`, was dissolved in enough water to make `250 mL` of solution. If sodium carbonate dissociates completely, molar concentration of `Na^(+)` and carbonate ions are respectively :

Options

A. 0.477 M and 0.477 M
B. 0.955 M and 1.910 M
C. 1.910 M and 0.955 M
D. 1.90 M and 1.910 M

Answer

C

Explanation

Molarity `=(25.3//106)/250 xx 1000`
= 0.955 M
`Na_(2)CO_(3) to 2Na^(+) + CO_(3)^(2-)`
`[Na^(+)] = 2 xx 0.95 = 1.910` M
`[CO_(3)^(2-)] = 0.955` M