Driving Question: How can conductivity be used to determine stoichiometric coefficients in a chemical reaction?
The purpose of this lab is to use conductivity to determine stoichiometric coefficients in a chemical reaction. This was done by taking various ratios of Ag solution and the unknown solution, with equal concentrations, and combining them. The conductivity was found in each the 9 different ratios, and the minimum conductivity ratio is the most likely ratio of the chemical reaction.
During a chemical reaction in which two solutions removes the ions from the combined solution, the conductivity is reduced. The ions are removed by the two solutions forming a gas or precipitate when combined.
When two solutions are combined in a ratio other than the stoichiometric ratio, the ions of one of the reactants will be in excess. This will result in greater conductivity. When two solutions have an equal amount of reactants from the ratio, the maximum number of ions is removed and the conductivity will be least.
The reaction between Ag and the unknown ion is shown as: