The Effect Of Temperature On The Rate Of Reaction With Hydrochloric Acid

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Title: The Effect Temperature of Sodium Thiosulfate Has On The Rate of Reaction with Hydrochloric Acid

Statement of Inquiry: What is the effect of changing a factor on the rate of chemical reaction?

Aim: The aim of this experiment is to observe how by increasing the temperature of sodium thiosulfate in a solution with 2.0 molar Hydrochloric acid can affect the rate of reaction and the rate in which a precipitate is formed.

Hypothesis: If the temperature of the sodium thiosulfate is increased, then the time it takes the precipitate to form will decrease therefore leading to the rate of reaction to increase as well. This can be explained as the temperature increases, the particles in the molecule will be moving more rapidly and hence as they move quicker, they will be colliding with other particles more frequently and with more energy. This energy will likely overcome the activation energy barrier and break the initial bonds and therefore produce a successful reaction and due to the increase in frequency of collisions, the time it takes the precipitate to form will decrease and since the product/precipitate is produced faster, therefore the rate of reaction will increase.

Balanced chemical equation of what will happen:
Na2S2O3 + 2HCl = 2NaCl + S + H2O+ SO2

Word Equation: sodium thiosulphate + hydrochloric acid = sodium chloride (salt) + sulphur + water + sulphur dioxide

Independent Variables:

❖ Increase in temperature of sodium thiosulfate
1) 40 degrees
2) 50
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