Question

		Drops of Stock Solutions			Temp. (K)	Reaction Time
Test Tube	KMnO4	H2O	H3O^+/H2SO4	C2O4H2
E-1	15	15	15	5	278 K	3 min 1 sec
E-2	15	15	15	5	300 K	6 min 13 sec

a. What effect does the temperature of the solutions have on the rate of the reaction? 


b. How does heating the reaction mixture affect the energy of the species in solution? What effect would cooling the reaction mixture have on the energy of the species in solution? 


c. Write a general, qualitative, statement about how the rate of a reaction depends on the temperature at which the reaction is carried out. 


Answer 1

Ans. a. Reaction time at temperature 278 K = 3 min 1 sec

            Reaction time at temperature 300 K = 6 min 13 sec

Reaction time at temperature 278 K is lower than that at 300 K. A lower reaction times indicates higher reaction rate.

Effect of temperature of reaction rate of this reaction- “Rate of reaction decreases with increase in temperature”.

Ans. b. Heating the reaction mixture increases the kinetic energy of the species in solution.

Colling the reaction mixture decreases the kinetic energy of the species in solution.

Ans. c. For this particular reaction- “The rate of reaction decrease with increase in temperature”.

Note: In general, rate of reaction increases with increase in temperature because the reactants have higher kinetic energy at higher temperature. Higher kinetic energy of reactant molecules increases the frequency of fruitful collisions, thus increasing rate of reaction.

Please re-check the temperature and their respective reaction time.