Question

Calculati cate grame de hidroxid de natiu reactioneaza cu 1000g de solutie de acid sulfuric cu concentractia 49%

Answer 1

Răspuns:

Explicație:

ms H2SO4 = 1000 g sol.

c= 49%

react. cu NaOH

masa de NaOH  = ?

-se afla md  H2 SO4

md= c. ms : 100

md= 49 . 1000 : 100=490g H2SO4

490g          xg

H2SO4 +2 NaOH= Na2 SO4 +2 H2O

98g           2.40g

x= 490 . 80 : 98 =400 g NaOH

n= m : M

n= 400g : 40g/moli=10moli NaOH

M H2SO4= 2 + 32 + 4.16=98-----> 98g/moli

MNaOH=23 + 16 + 1=40----> 40g/moli