Question 1 The rate of a reaction is related to solubility in this manner: Subst

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Question 1 The rate of a reaction is related to solubility in this manner: Substances that are soluble dissociate and are availabel to participate in the reaction. Substances that are not soluble remain associated as crystals and are not available to participate in the reaction. Here are the facts: Water is very polar covalent, oxalic acid is only slightly polar covalent, iron (III) sulfate is ionic. Write the formula for iron (III) sulfate: Which is more soluble in water, oxalic acid or iron (III) sulfate? Which will react more quickly, oxalic acid or iron (III) sulfate? Question 2 When comparing reaction rates, one test tube contains the reactant chemical with only distilled water added. What is the purpose of the distilled water? To show what the chemical looks like when it is dilute. To adjust the pH of the solution. To provide a negative result, a control for comparison.

Explanation / Answer

Formula for Iron sulphate is Fe2(SO4)3 . Since Fe2(SO4)3 is ionic in nature , therefore it dissociates more easily as compared to oxalic acid. So , Fe2(SO4)3 is more soluble in water and hence also reacts more quickly.

Distilled water is added to adjust the pH of the solution.

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