M,Ca= 40g/mol M,H2O= 18g/mol MCa(OH)2= 74g/mol
Ca reactioneaza cu o parte din apa, formeaza Ca(OH)2 care se dizolva in apa ramas in urma reactiei
1mol........2mol.........1mol.
Ca + 2H2O----->Ca(OH)2 + H2
40g..........2x16g..........74g\
5g..............x..................y
x= 4,5g-----. > ramane m,apa= 100-4,5 g
y= 9,25g este masa dizolvata,md, in solutia formata
c=mdx100/ms= 9,25x100/ 95,5=.....................calculeaza !!!!!
