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The concentration profile below represents a change to the above equilibrium system at time $t_1$: The following concentrations are represented: - $[Fe(SCN)]^{2+}$ - $[Fe^{3+}]$ - $[SCN^-]$ Which one of the following would account for the changes in concentration at time $t_1$? A - VCE - SSCE Chemistry - Question 7 - 2012 - Paper 1
Question 7
![The-concentration-profile-below-represents-a-change-to-the-above-equilibrium-system-at-time-$t_1$:--The-following-concentrations-are-represented:----$[Fe(SCN)]^{2+}$----$[Fe^{3+}]$---$[SCN^-]$--Which-one-of-the-following-would-account-for-the-changes-in-concentration-at-time-$t_1$?--A-VCE-SSCE Chemistry-Question 7-2012-Paper 1.png](https://cdn.simplestudy.io/assets/backend/uploads/question/subject_1954_paper_21229_a_q7_67bdc92f.jpg)
The concentration profile below represents a change to the above equilibrium system at time $t_1$: The following concentrations are represented: - $[Fe(SCN)]^{2+}$... show full transcript
Worked Solution & Example Answer:The concentration profile below represents a change to the above equilibrium system at time $t_1$: The following concentrations are represented: - $[Fe(SCN)]^{2+}$ - $[Fe^{3+}]$ - $[SCN^-]$ Which one of the following would account for the changes in concentration at time $t_1$? A - VCE - SSCE Chemistry - Question 7 - 2012 - Paper 1
Step 1
A. the addition of SCN^-
Answer
The addition of SCN^- increases the concentration of thiocyanate ions in the system. According to Le Chatelier's Principle, this will shift the equilibrium to the right, forming more of the complex ion while decreasing the concentration of as it reacts with the added . This explains the observed changes in concentration at time .