解：m(NaOH)=13.3g-5.3g=8g
???$\mathrm {NaOH+HCl}\xlongequal[]{}\mathrm {NaCl+H}_2\mathrm {O}$???
40 36.5
8g m(HCl)
???$\mathrm{m(HCl)=8g×\frac{ 36.5 }{ 40 } =7.3g } $???
? ??$\mathrm{ m(鹽酸)=\frac{ 7.3g }{ 14.6％ }×100％=50.0g } $??
答：所用鹽酸的質(zhì)量為50.0g。?
