Question

1.How would each of the following modifications to the experimental procedure used in this investigation affect the mass of product obtained? Indicate if the mass of product would be greater, less, or unchanged. Explain your reasoning.

(a) The KI solution is added to the Pb(NO3)2 solution instead of adding the Pb(NO3)2 solution to the KI solution.

(b) The temperature of the reactant solutions is 40 oC instead of room temperature.

(c) The residue is washed with hot distilled water instead of cold distilled water.

(d) The residue is not washed with distilled water at all.

(e) The reactions were performed using 6.00 mL of 2.00 M KI instead of 6.00 mL of 1.00 M KI.

Answer 1

(a) The KI solution is added to the Pb(NO3)2 solution instead of adding the Pb(NO3)2 solution to the KI solution ---> both the ways the product formed is same.

(b) The temperature of the reactant solutions is 40 oC instead of room temperature.-----> in hot condition KI wil dissociate and less precipitate will be formed.

(c) The residue is washed with hot distilled water instead of cold distilled water.-----> KI will lost along with hot water.

(d) The residue is not washed with distilled water at all. ---> Unchanged.

(e) The reactions were performed using 6.00 mL of 2.00 M KI instead of 6.00 mL of 1.00 M KI.----> less KI will be formed.