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 !!!!