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3 g de hidroxid de sodiu se gasesc dizolvate in 250 cm3 (cubi) de solutie. care este molaritatea acestei solutii ?
(ANa=23 ,AO=16, AH=1)


Răspuns :

md=3g NaOH
Vs=250cm3=0.25L
MNaOH=40g/mol

Cm=md/M*Vs=3/40*0.25=3/10=0.3 moli/L
md=3gNaOH
Vs=250cm³=0,25dm³=0,25L
_____________
?Cm
_____________
Cm=n/Vs
MNaOH=23+16+1=40g/mol
Cm=3/40*0,25=3/10 mol/L