Answer to Question #298834 in Physical Chemistry for Juleng

Question

When potassium dichromate (K2CrO4) is added to a solution containing 0.500g silver nitrate (AgNO3) solid silver chromate (Ag2CrO4) is formed

Answer 1

The balanced equation is below:

K₂CrO₄(aq) + 2AgNO₃(aq) --> Ag₂CrO₄(s) + 2KNO₃(aq)

It is unclear what is required in this problem, but the mass of AgNO₃ allows to determine the mass of the precipitate mentioned in the question.

Molar masses are:

AgNO₃ - 169.9 g/mol

Ag₂CrO₄ - 331.7 g/mol

$m(Ag_2CrO_4)=0.500\ g(AgNO_3)\times\frac{1\ mol(AgNO_3)}{169.9\ g(AgNO_3)}\times\frac{1\ mol(Ag_2CrO_4)}{2\ mol(AgNO_3)}\times\frac{331.7\ g(Ag_2CrO_4)}{1\ mol(Ag_2CrO_4)}=0.488\ g$