Question

in order for the gravimetric analysis to be valid, we want all of the chloride ions to precipitate. how can we ensure this? remember the reaction equation is: xcl₂ + 2agno₃ -> 2agcl + xno₃ a) by adding the same volume of reactants b) by ensuring silver ions are in excess c) by ensuring chloride ions are in excess d) by having roughly the same amount of each reactant

Explanation:

In a precipitation reaction for gravimetric analysis, to ensure all chloride ions precipitate, the reactant containing the counter - ion (silver ions in this case) should be in excess. This drives the reaction to completion in the forward direction according to Le Chatelier's principle.

Answer:

B. By ensuring silver ions are in excess