Question

Cate grame de hidroxid de natiu reactioneaza cu 1000g de solutie de acid sulfuric cu concentractia 49% pleaseeeee

Answer 1

Răspuns:

calculez masa de acid din solutie

c=mdx100/ms---> md= 1000x49/100g=490gH2SO4

calculez moli H2SO4 stiind  miu= 98g/mol

niu=m/miu= 490/98mol= 5molH2SO4

deduc moli NaOH. din ecuatia chimica

2mol...........1mol

2NaOH + H2SO4---> Na2SO4 + 2H2O

x...................5mol

x=niu=10mol NaOH

calculez msa ade NaOH.stiind miu=40g/mol

m= niuxmiu= 10x40g=400gNaOH

Explicație: