Maintaining constant ionic strength is an important component of the experimenta

Question

Maintaining constant ionic strength is an important component of the experimental design. Predict the effect on the reaction rate if distilled water was added to reaction mixtures I-4 instead of the (NH_+)_2 s_2 O_4 solution. Explain your reasoning. Predict the effect on the reaction rate if distilled water was added to reaction mixtures 5 instead of the KNO_3, solution. Explain your reasoning. Would replacing the (NH_4)_2S_2O_8 solution with distilled water in mixtures 1-4 have a smaller, the same, or a larger effect on the reaction rate than replacing the KNO_3 solution with distilled water in mixtures 5-8. Explain your reasoning.

Explanation / Answer

2. Maintaining constant ionic strength in a reaction

a. If instead distillated water is added to the reaction. The rate of the reaction would decrease as th ionic strength would decrease. Dilution lowers the concentration of the solution and thus the ionic strength.

b. Adding distilled water instead of KNO3 would lower the ionic strength of the resultant solution. This thus would decrease th rate of reaction.

c. Replacing a (NH4)2S2O8 giving three ions in solution with distilled water would have a larger effect on the reaction rate when compare to KNO3 producing only two ions in solution.

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