In an experiment, hydrochloric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was formed during the reaction. A cross drawn at the base of each flask became gradually invisible due the formation of this yellow precipitate. The time taken for the cross to become invisible was recorded. A partial record of the experiment is shown. Experimental Record Flask Volume of HCl Volume of Sodium Thiosulfate Volume of Water Time 1 10 mL 10 mL 40 mL 14 seconds 2 10 mL 20 mL 30 mL 3 10 mL 30 mL 20 mL 4 10 mL 40 mL 10 mL Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs. (5 points)

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Explanation:

The time taken for the cross to disappear is a measure of the rate of reaction. Let us remember that the rate of reaction depends on the concentration of the reactants.

The concentration of reactants increases when the volume of water added decreases. This is because, more reactant particles are available in the system and they collide more frequently with each other.

Since the volume of added water decreases as we move down the table, the concentration of the reactants increases hence it takes lesser time for the cross to disappear as we move down the table.

Hence, the last column(time) decreases as we more down the table due to increase in concentration.

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