chemistry 111

Question

if the mass % of cl- was 27.87 % and 19.75 ml of 0.1 M Agno3 was used to titrate, what was the mass of the original unknown chloride sample

Answer 1

0.01975 L x 0.1 mole/L = 0.001975 moles AgNO3

AgNO3 + Cl- ==> AgCl(s) + NO3-

0.001975 moles AgNO3 = 0.001975 moles of Cl-

mass of Cl- = 0.001975 moles x 35.45 g/mol = 0.0700 g Cl-

0.0700 g/x g  = 0.2787

x = 0.2512 grams