How many grams of sodium bicarbonate, NaHCO3, are needed to make 200.0 ml of a 0.250 M solution?
n(NaHCO3)=c×V=0.2×0.25=0.05 mol
M(NaHCO3)=23+1+12+48=84 g/mol
m(NaHCO3)=n×M=0.05×84=4.2 g
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