In an experiment, sulfuric 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. 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.

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Explanation:

The rate of reaction depends on the concentration of reactants, as the concentration of reactants increases the rate of reaction increases and vice versa.

This follows from the collision theory, the greater the reactant concentration, the greater the population of particles in solution whose collision leads to reaction.

If we look at the table, the reactants were diluted steadily (concentration of reactants were decreased) as more water was added while constantly decreasing the thiosulphate volume.

This decrease in reactant concentration leads to a decrease in the number of collisions and subsequently a decrease in the rate of reaction.

If this is the case, then the last column (time) increases steadily(look at the image attached).

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