---
title: "A student assembles the following concentration cell at \\(25^\\circ\\text{C}\\), using a \\(\\text{KNO}_3\\text{(aq)}\\) salt bridge.  \\(\\text{Ag(s)}\\mid\\text{Ag}^+\\text{(aq)},\\ 0.010\\text{ M}\\parallel\\text{Ag}^+\\text{(aq)},\\ \\text{variable concentration}\\mid\\text{Ag(s)}\\)  The positive terminal of a voltmeter is connected to the right electrode. The student varies the right-half-cell concentration and graphs the measured potential difference, \\(E_{\\text{right}}-E_{\\text{left}}\\), as a function of \\(\\log\\!\\left(\\dfrac{[\\text{Ag}^+]_{\\text{right}}}{[\\text{Ag}^+]_{\\text{left}}}\\right)\\).  Which statement correctly interprets point P and predicts the spontaneous direction of electron flow through an external wire?"
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url: "https://nerd-notes.com/ubq/119526/"
date_modified: "2026-08-19T12:41:07+00:00"
---

# A student assembles the following concentration cell at \(25^\circ\text{C}\), using a \(\text{KNO}_3\text{(aq)}\) salt bridge.

\(\text{Ag(s)}\mid\text{Ag}^+\text{(aq)},\ 0.010\text{ M}\parallel\text{Ag}^+\text{(aq)},\ \text{variable concentration}\mid\text{Ag(s)}\)

The positive terminal of a voltmeter is connected to the right electrode. The student varies the right-half-cell concentration and graphs the measured potential difference, \(E_{\text{right}}-E_{\text{left}}\), as a function of \(\log\!\left(\dfrac{[\text{Ag}^+]_{\text{right}}}{[\text{Ag}^+]_{\text{left}}}\right)\).

Which statement correctly interprets point P and predicts the spontaneous direction of electron flow through an external wire?

A student assembles the following concentration cell at \(25^\circ\text{C}\), using a \(\text{KNO}_3\text{(aq)}\) salt bridge.

\(\text{Ag(s)}\mid\text{Ag}^+\text{(aq)},\ 0.010\text{ M}\parallel\text{Ag}^+\text{(aq)},\ \text{variable concentration}\mid\text{Ag(s)}\)

The positive terminal of a voltmeter is connected to the right electrode. The student varies the right-half-cell concentration and graphs the measured potential difference, \(E_{\text{right}}-E_{\text{left}}\), as a function of \(\log\!\left(\dfrac{[\text{Ag}^+]_{\text{right}}}{[\text{Ag}^+]_{\text{left}}}\right)\).

Which statement correctly interprets point P and predicts the spontaneous direction of electron flow through an external wire?

![Draw a grayscale Cartesian graph with light gridlines. Label the horizontal axis \(\log\!\left(\dfrac{[\text{Ag}^+]_{\text{right}}}{[\text{Ag}^+]_{\text{left}}}\right)\), spanning \(-2\) to \(+2\) with ticks at each integer. Label the vertical axis \(E_{\text{right}}-E_{\text{left}}\text{ (V)}\), spanning \(-0.12\) to \(+0.12\) with ticks at \(-0.12\), \(-0.06\), \(0\), \(+0.06\), and \(+0.12\). Draw one solid straight line passing through \((-2,-0.118)\), \((-1,-0.059)\), \((0,0)\), \((1,0.059)\), and \((2,0.118)\). Mark the final point with a filled circle labeled P. Include no title or legend. No other labels, curves, symbols, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787143267-NVhMPY.jpg)

- **A.** At P, \([\text{Ag}^+]_{\text{right}}=\dfrac{1}{100}[\text{Ag}^+]_{\text{left}}\), and electrons flow from right to left because oxidation occurs in the more dilute half-cell.
- **B.** At P, \([\text{Ag}^+]_{\text{right}}=2[\text{Ag}^+]_{\text{left}}\), and electrons flow from left to right because reduction occurs in the more concentrated half-cell.
- **C.** At P, \([\text{Ag}^+]_{\text{right}}=100[\text{Ag}^+]_{\text{left}}\), and electrons flow from right to left because reduction occurs in the more dilute half-cell.
- **D.** At P, \([\text{Ag}^+]_{\text{right}}=100[\text{Ag}^+]_{\text{left}}\), and electrons flow from left to right because reduction occurs in the more concentrated half-cell.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119526/*