H2PO (aq) + OH (aq) + Pd (s) -> HPO4 (aq) + H2O (l)
The rate law for this reaction was determined experimentally to be:
Rate=k[H2PO4]3[OH]
A. What do you think the purpose of the Pd (s) is?
B. Define the reaction order with respect to each reactant.
C. What is the overall reaction order?
D. Consider the hydroxide ion, how could you prove (graphically) that the reaction order denoted above is true?
a) The purpose of the metal Pd is to act as a catalyst in order to reduce the energy barrier for the reaction by providing the surface for the reaction
b) Reaction order with respect to H2PO4- will be 3
Reaction order with respect to OH- will be equal to 1
c) Overall Reaction order will be (3+1) = 4
d) For [OH-] since it is order 1 with respect to reaction, we can plot the graph of ln[OH-], which is the ln of the concentration of OH- with respect to time to make sure it is a straight line in order to satisfy the first order in the overall reaction order.
Note - Post any doubts/querie in comments section.
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