Question

25.3 g of sodium carbonate, it is dissolved in enough water to make 250ml of solution. if sodiumcarbonate dissociates completely ,molar concentration of sodium ion and carbonate ions are respectively(molarmass of na2co3=106grs)​

Answer 1

Explanation:

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Answer 2

Given,

No. of moles of Na2co3 = Weight /Molecular weight

$= \frac{25.3}{106}$

$= 0.239$

Molarity of solution = No.fo moles of solute /Volume of solution in litre.

$= \frac{0.239}{0.25}$

$= 0.956mol \: lit$

Na2co3 -------->2Na+ +Co3^-2

Conc of co3^-2 = 0.956 mol/lit

Conc of 2Na+ = 2×0.956

=1.912 mol/ lit