Consider the following equilibrium system - HSC - SSCE Chemistry - Question 22 - 2021 - Paper 1
Question 22
Consider the following equilibrium system.
2CrO_4^{2-}(aq) ⇌ Cr_2O_7^{2-}(aq) + H_2O(l)
The solution is orange.
Justify TWO ways to shift the equilibrium to the l... show full transcript
Worked Solution & Example Answer:Consider the following equilibrium system - HSC - SSCE Chemistry - Question 22 - 2021 - Paper 1
Step 1
Justification 1: Reducing Hydrogen Ion Concentration
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Answer
The concentration of hydrogen ions (H+) in the solution could be reduced. This action would increase the concentration of chromate ions (CrO42−), shifting the equilibrium to the left and thus making the solution more yellow.
Step 2
Justification 2: Heating the Solution
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Answer
Heating the solution would drive the reaction to the left, as the forward reaction is exothermic. By increasing the temperature, the equilibrium would shift towards producing more yellow chromate ions (CrO42−), changing the colour of the solution.
