Consider the possible experimental errors below when monitoring the rate of deco

Question

Consider the possible experimental errors below when monitoring the rate of decomposition of hydrogen peroxide, as shown in the reaction. Determine how the rate law would be affected, if at all, by each error. Click the box to indicate whether the error would increase or decrease the rate relative to what is expected. If the error is not expected to affect the rate law, leave the box empty The hydrogen peroxide is left in an open container prior to the start of the experiment and is partially decomposed. Data from the temperature probe is given in Celsius but assumed to be Fahrenheit. The syringe used to dispense the catalyst, potassium iodide, contains air bubbles. A 125-mL Erlenmeyer flask is not available, so a 250-mL flask is used.

Explanation / Answer

In 1st case, hydrogen peroxide is kept in an open flask that resultrein the half of the feed decomposition but in more time, when experiment is started the rate of reaction will be low due to low initial concentration of reactant. So the experiment defect results in decrease of rate of reaction.

In 2nd case, the temperature in the reactor is higher than we think. The high temeperature favors the rate of decomposition of hydrogen peroxide. So the error occured due to this experimwnt results in increase in rate of reaction relative to the expected one.

In 3rd case, the catalyst injecting syringe contains air bubbles which results in vigorous nature of catalyst when dispensed into the reactor. Due to this the catalyst gets more active and provides more number of active sites which enhances the rate of reaction.

In 4rth case, 250ml flask is used instead of 125ml flask which in turn results in the error of analysing feed composition. However there might not be more error between the expected and real rate of reaction due to this experimental defect.

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