Question

The vendor provided 95% pure antimony trioxide [Sb2O3] powder chemical. Molar mass of elements (Sb: 121.8 g/mol; O: 16 g/mol). Solve the following problems to get accurate initial Sb(III) concentration for lab-scale experiments. Hint: The Sb(III) solution needs to be prepared in 1 M HCl solution.

i.How much chemical in mg/L will be required for preparation of 1 g/L Sb(III) stock solution?

ii.What will be the dilution factor to prepare 10 mg/L Sb(III) solution?

Answer 1

95% pure antimony trioxide [Sb2O3]

Sb: 121.8 g/mol

O: 16 g/mol

1 M HCl solution

(i.)Chemical in mg/L will be required for preparation of 1 g/L Sb(III) stock solution

=121.8g/mol+16 g/mol=137.8 g/mol

=137.8 g/mol$\times$ 0.95

=130.91mg/L

(ii.) The dilution factor to prepare 10 mg/L Sb(III) solution

=$\frac{130.91mg/L \times× 0.05}{0.95}$

= 6.89