25cm³ of a solution contains 1.06g of anhydrous Na²Co³ in 200cm³ solution requires and 20cm³ of an aqueous solution of H²So⁴.
a.what is the concentration of acid solution in mol/dm³? (Na=23,C=12,O=16)
b.calculate the mass conc
c.molar conc
Show your workings accordingly.
a. The concentration of the acid solution in mol/dm³ is 0.1 mol/dm³.
Calculation:
1.06 g of anhydrous Na²Co³ = 0.01 mol
200 cm³ of solution = 0.2 dm³
Therefore, 0.01 mol/0.2 dm³ = 0.1 mol/dm³
b. The mass concentration of the acid solution is 0.5 g/dm³.
Calculation:
20 cm³ of aqueous solution of H²So⁴ = 0.02 dm³
Therefore, 0.02 dm³ x 0.1 mol/dm³ x 98 g/mol = 1.96 g
Therefore, 1.96 g/0.02 dm³ = 0.5 g/dm³
c. The molar concentration of the acid solution is 0.1 mol/dm³.
Calculation:
As stated in part a, the molar concentration of the acid solution is 0.1 mol/dm³.