Question

Ce masa de apa trebuie adaugata pentru a transforma 200g oleum (20%SO3) intr o solutie de H2SO4 98%?
SO3 + H2O = H2SO4

Answer 1

in 100g oleum......20gSO3......80gH2SO4

   200g.......................x=40g...........y=160g

dar, SO3 existent, produce o masa suplimentara de acid, conform reactiei date:

 80gSO3..........98gH2SO4

40g............................x= 49g acid

m,total acid= 160+49=> 209g--acid

concentratia oleumului devine

c= mdx100/ms= 209x100/200= 104,5%

a doua solutie, trebuie sa contina 98g acid in 1oogsolutie

100g oleum...........104,5g acid

x..................................98g

x= 93,8g.....

pana la ms= 100g, trebuie sa se aduge peste 100g oleum, apa:

m,apa= 100g sol-93,8g oleum=6,2g