Question

2 moli hidroxid de cupru 2sunt neutralizati de o solutie de HCl de concentratie 36.5%
-sa se scrie ecuatia de reactie chimica
-sa se calculeze masa solutiei de HCl care s a consumat?

Answer 1

M,HCl= 36,5g/mol

din ecuatia chimica , calculez moli HCl ce reactioneaza cu baza data

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

Cu (OH)2  + 2HCl----> CuCl2 + 2H2O

2mol.................x=niu= 4mol HCl

m= niuxM= 4x36,5g= 146g HCl

calculez masa de solutie ce contine md= 146g acid

c=mdx100/ms= > ms=146x100/36,5 g=........................calculeaza !!!!