The amount in moles of spilled sulfuric acid is
"n(H_2SO_4) = c(H_2SO_4) \\cdot V(H_2SO_4)"
According to stoichiometry of the chemical reaction
"2NaHCO_{3(s)}+H_2SO_{4(aq)} \\rightarrow Na_2SO_{4(aq)}+2H_2O_{(l)}+2CO_{2(g)}"
the amount of sodium bicarbonate is two times of the amount of sulfuric acid. Thus
"n(NaHCO_3) = 2 \\cdot n(H_2SO_4)"
The mass of sodium bicarbonate can be calculated:
"m(NaHCO_3) = n(NaHCO_3) \\cdot M(NaHCO_3) = 2 \\cdot c(H_2SO_4) \\cdot V(H_2SO_4) \\cdot M(NaHCO_3) = 2 \\cdot 6.0 \\frac{mol}{L} \\cdot 0.027 L \\cdot 84 \\frac{g}{mol} = 27g"
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