Which of the following experimental methods cannot be used to measure the rate o

Question

Which of the following experimental methods cannot be used to measure the rate of a reaction? measurement of the change in the partial pressure of a gas-phase reactant over time measurement of the equilibrium concentration of an acidic product via titration with a strong base measurement of the absorbance of a colored reactant with time measurement of the absorbance of a colored product with time measurement of the change in the partial pressure of a gas-phase product over time none of the above can be used to measure the rate of the reaction I don't know

Explanation / Answer

b. measurement of the equilibrium concentration of an acidic product via titration with a strong base.

To determine a rate of reaction, you measure a specific change of either the product or reactant over time.

Answer b, measures the equilibrium concentration. Equilibirium is a state of dynamic balance where the ratio of the product and reactant concentration is constant. This means b does not measure change. If b had said: measurement of change is concentration of an acid product via titration with a strong base, it would have been correct.

In other words:

a. measurement of change in partial pressure ....

b. measurement of equilibrium concentration of acid product.... (there is no change)

c. measurement of absorbance of color.... (absorbance in color implies a change from one color to another)

d. measurement of absorbance of color....

e. measurement of change in parital pressure....

Hope this helps. :)

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