Question

Chlorine is used by textile manufacturers to bleach cloth. excess chlorine is destroyed by its reaction with sodium thiosulfate, na 2 s 2 o 3 : na 2 s 2 o 3(aq) + 4cl 2g) + 5h 2 o (ako)  2 nahso4(aq) + 8hcl (aq)

a. how many moles of na 2 s 2 o 3 are needed to react with 0.12mol of cl 2

Answer 1

0.030 mol Na2S2O3

From the balanced equation, the molar ratio of Na2S2O3:Cl2 is 1:4.

∴ Moles of Na2S2O3 = 0.12 mol Cl2 x (1 mol Na2S2O3/4 mol Cl2)

= 0.030 mol Na2S2O3