Suggest experimental means by which the rates of the following reactions could b

Question

Suggest experimental means by which the rates of the following reactions could be monitored. Explain your answer. (i.e. how the pressure would change, how the color would change) 2NaN_3 (s) rightarrow 2Na (s) + 3N_2(g) Cl_2 (g) + 2Br^- (aq) rightarrow Br_2 (aq) + 2Cl^- (aq) C_2 H_6 (g) rightarrow C_2 H_4(g) + H_2(g) H_2 (g) + I_2 (g) rightarrow 2HI(g) Aquatic plants also conduct photosynthesis. The reaction takes place in water The CO_2 is obtained from dissolved CO_2 in the form of HCO_3^- (aq). How could this reaction be monitored ? CO_2 (g) + H_2O (l) rightarrow C_6 H_12 O_6 + O_2(g)

Explanation / Answer

a) for the reaction 2NaN3(s) ----> 2Na +3N2(g), the pressrue builds up in a vessel since a gaseous product is formed.

Hence by monitoring the pressure, one can find out the course of reaction

b) since chlorine is a gas and Bromine is in aquesous medium, the pressure drops duirng the course of reaction.

c) Here also the pressure rise in an indication of rate of reaction

d) When HI is left open it undegors oxidation to give rise to HI3 which is dark in color. This color test can be used to monitor

2.since Carbonic acid is formed, monitoring the pH gives the extent of reaction

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