Modelová Otázka ID 3668 - 
Kolik gramů dusičnanu stříbrného je potřeba pro úplné vysrážení chloridových iontů z roztoku vzniklého rozpuštěním 25 g chloridu sodného? Ar(Ag) = 108; Ar(Na) = 23; Ar(Cl) = 35,5
Správná odpověď je: B
Rovnice bude vypadat takto:
AgNO3 + Cl− → AgCl + (NO3)−.
1 mol NaCl obsahuje 1 mol Cl−, který beze zbytku reaguje s 1 mol AgNO3. Výpočet provedeme následovně:
n = m(NaCl)/M(NaCl)
m = n · M(AgNO3) = [m(NaCl)/M(NaCl)] · M(AgNO3)
m = (25/58,5) · 170 = 72,65 g.
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