Chlorine dioxide and hydroxide ions react to form chlorate ions, chlorite ions,

ID: 801552 • Letter: C

Question

Chlorine dioxide and hydroxide ions react to form chlorate ions, chlorite ions, and water.

2 ClO2(aq) + 2 OH(aq) ? ClO3(aq) +ClO2(aq) + H2O(l)

The reaction is found to be second order with respect to chlorine dioxide and first order with respect to hydroxide ions.

a) Write a rate equation for the reaction.

b) What is the overall order of reaction?

c) What would you expect the effect on rate to be of doubling the concentration of chlorine dioxide?

d) What would you expect the effect on rate to be of doubling the concentration of hydroxide ions?

a. R = k[ClO2]^2[OH]

b. Overall order = 2+1 = 3

c. Doubling the concentration of chlorine dioxide will increase rate by four times.

R = k[2ClO2]^2[OH] = 4k[ClO2]^2[OH]

d. Doubling hydroxide ion concentration will double rate too.

R = k[ClO2]^2[2OH] = 2k[ClO2]^2[OH]

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