Cho 100 ml dung dịch \(N{a_2}C{O_3}\) 0,75M tác dụng vừa đủ với 100 gam dung dịch \(C{H_3}COOH\) a%. Tính a.
\({n_{N{a_2}C{O_3}}} = 0,1.0,75 = 0,075mol\)
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Phương trình hóa học:
\(\begin{array}{l}2C{H_3}COOH + N{a_2}C{O_3} \to 2C{H_3}COONa + C{O_2} \uparrow + {H_2}O\\\,\,0,15\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \leftarrow 0,075\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,mol\\Theo\,pt\, \to {n_{C{H_3}COOH}} = 0,15\,mol\\a = \dfrac{{{m_{C{H_3}COOH}}}}{{{m_d}}}.100 = \dfrac{{60.0,15}}{{100}}.100 = 9\% .\end{array}\)