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ms=250ml NaOH
CM(concentratia molara)=0.1M
md=?


Răspuns :

-calculez numarul de moli dizolvati
c= n/V=> n= 0,1x0,250= 0,025moli
calculez masa acestor moli, stiind M,NaOH= 40g/mol
m= nxM= 0,025molx40g/mol=.....................calculeaza !!!!