---
title: "A student prepares an aqueous solution containing the equilibrium system represented below:  \\[ \\text{Fe}^{3+}\\text{(aq)} + \\text{SCN}^-\\text{(aq)} \\rightleftharpoons \\text{Fe(SCN)}^{2+}\\text{(aq)} \\quad K_c \\]  The student adds distilled water to double the total volume of the solution at constant temperature. Immediately after the addition of water, which of the following correctly relates the reaction quotient, \\(Q_c\\), to the equilibrium constant, \\(K_c\\), and describes the direction the system will shift to restore equilibrium?"
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url: "https://nerd-notes.com/ubq/120291/"
date_modified: "2026-08-23T04:04:18+00:00"
---

# A student prepares an aqueous solution containing the equilibrium system represented below:

\[ \text{Fe}^{3+}\text{(aq)} + \text{SCN}^-\text{(aq)} \rightleftharpoons \text{Fe(SCN)}^{2+}\text{(aq)} \quad K_c \]

The student adds distilled water to double the total volume of the solution at constant temperature. Immediately after the addition of water, which of the following correctly relates the reaction quotient, \(Q_c\), to the equilibrium constant, \(K_c\), and describes the direction the system will shift to restore equilibrium?

A student prepares an aqueous solution containing the equilibrium system represented below:

\[ \text{Fe}^{3+}\text{(aq)} + \text{SCN}^-\text{(aq)} \rightleftharpoons \text{Fe(SCN)}^{2+}\text{(aq)} \quad K_c \]

The student adds distilled water to double the total volume of the solution at constant temperature. Immediately after the addition of water, which of the following correctly relates the reaction quotient, \(Q_c\), to the equilibrium constant, \(K_c\), and describes the direction the system will shift to restore equilibrium?

- **A.** \(Q_c = \dfrac{1}{2}K_c\), and the system will shift toward products.
- **B.** \(Q_c = \dfrac{1}{2}K_c\), and the system will shift toward reactants.
- **C.** \(Q_c = 2K_c\), and the system will shift toward products.
- **D.** \(Q_c = 2K_c\), and the system will shift toward reactants.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120291/*