Question

The rate constant k for the following reaction                                   &nb

The rate constant k for the following reaction

                                    H2O2 + 2KI + 2H+ = 2H2O + I2(aq) + 2K+

was found to vary with temperature when the reactant concentrations were held constant at [H2O2] = 0.556 M and [KI] = 120 M.

a) temperature = 44.5 degrees Celsius; rate of constant (k) = 1.66 x 10-3 k

b) temperature = 35 degrees Celsius; rate of constant (k) = 1.02 x 10-3​ k

c) temperature = 25.7 degrees Celsius; rate of constant (k) = 6.63 x 10-4​ k

d) temperature = 15.1 degrees Celsius; rate of constant (k) = 2.98 x 10-3​ k

e) temperature = 4.5 degrees Celsius; rate of constant (k) = 1.17 x 10-3​ k

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Answer #1

rate constatnt of a reaction is changes with temperature .that was mathematically explained by arrhenius equation.

                  log K = logA - (Ea /2.303RT)

AS THE TEMPERATURE INCREASES THE RATE CONSTANT ALSO INCREASES EVEN THOUGH CONCENTRATION OF THE REACTION WERE HELD CONSTANT.BECAUSE WITH INCREASE THE TEMPERATURE, MOST OF THE REACTANT MOLECULES CROSS TTHE THRESHOLD ENERGY BARRIER. AS A RESULT THEY ARE CONVERTED INTO PRODUCTS .THAT MEANS RATE OF THE REACTION INCREASES SO RATE CONSTANT ALSO INCREASES .

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