Answer to Question #96644 in Inorganic Chemistry for Selena Pak

Question

10cm3, 0.12 mol/dm3 of sodium sulfite acidified with reagent hydrochloric acid solution. Then we add 10 cm3 10g/dm3 mass concentration of hydrogen sulfide solution. How many grams of sulfur precipitates?

Answer 1

Na₂SO₃ + 6HCl + 2Na₂S = 6NaCl + 3S + 3H₂O

n(Na2SO3)= 1.20*10^-3 mol

n(Na2S)= 2.94*10^-3 mol

m(S)=1.2*10^-3*3*32=0.1152 g