ZnCl2 + 2AgNO3 = Zn(NO3)2 + 2AgCl
n(AgNO3) = V(AgNO3) ∙ C(AgNO3) = 0.035 / (V(NaCl) ∙ 0.005 / 0.025) = 1.75 / V (NaCl)
m(ZnCl2 ∙ 6H2O) = 2 ∙ n(AgNO3) ∙ M(ZnCl2 ∙ 6H2O) = 488.6 ∙ n(AgNO3) = 279.2 ∙ V(NaCl)
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