6. A reaction is performed to study the reaction of UO2 with hydrogen ion in aqu

Question

6. A reaction is performed to study the reaction of UO2 with hydrogen ion in aqueous solutiorn And the data below shows initial reaction rate of this reaction under different reactant conditions. The measurement was done at 20 °C. Experiment[UO2To M 1.45x 103 2.90x 103 1.45x 10-3 2.90x 103 H'lo, M 1.37 1.37 2.74 2.74 Initial Rate, M/s 2.32x104 9.26x104 4.64x10 1.85x10 a) Find out the rate law of this reaction b) Calculate the rate constant (k) of this reaction with correct unit c) (extra credit) If a new experiment was performed using 0.0250 M of UO2 and 2.00 M of H', what will be the initial rate of this reaction?

Explanation / Answer

a) if we double the concentration of UO+ rate increased by times so second order with respect to UO +

if we double the H+ rate also doublled so first order with respect to H+

rate law as follows

rate = K[UO2+]2 [H+]

b) K = rate / [UO2+]2 [H+]

K = 2.32 x 10-4 / [0.00145]2 [1.37]

K = 2.32 x 10-4 / 2.88 x 10-6

K = 80.5 M-2s-1

c) rate = 80.5 [0.0250]2[2.00]

rate = 0.10 M/s

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