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title: "In an analytical chemistry laboratory, a student determines the concentration of iron in an aqueous solution by titrating an acidified sample of \\(\\text{Fe}^{2+}\\text{(aq)}\\) with standard potassium dichromate, \\(\\text{K}_2\\text{Cr}_2\\text{O}_7\\text{(aq)}\\). During the titration, \\(\\text{Fe}^{2+}\\text{(aq)}\\) is oxidized to \\(\\text{Fe}^{3+}\\text{(aq)}\\) while \\(\\text{Cr}_2\\text{O}_7^{2-}\\text{(aq)}\\) is reduced to \\(\\text{Cr}^{3+}\\text{(aq)}\\). Which of the following is the balanced net ionic equation for the reaction that occurs in the acidic solution?"
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url: "https://nerd-notes.com/ubq/119689/"
date_modified: "2026-08-21T08:12:03+00:00"
---

# In an analytical chemistry laboratory, a student determines the concentration of iron in an aqueous solution by titrating an acidified sample of \(\text{Fe}^{2+}\text{(aq)}\) with standard potassium dichromate, \(\text{K}_2\text{Cr}_2\text{O}_7\text{(aq)}\). During the titration, \(\text{Fe}^{2+}\text{(aq)}\) is oxidized to \(\text{Fe}^{3+}\text{(aq)}\) while \(\text{Cr}_2\text{O}_7^{2-}\text{(aq)}\) is reduced to \(\text{Cr}^{3+}\text{(aq)}\). Which of the following is the balanced net ionic equation for the reaction that occurs in the acidic solution?

In an analytical chemistry laboratory, a student determines the concentration of iron in an aqueous solution by titrating an acidified sample of \(\text{Fe}^{2+}\text{(aq)}\) with standard potassium dichromate, \(\text{K}_2\text{Cr}_2\text{O}_7\text{(aq)}\). During the titration, \(\text{Fe}^{2+}\text{(aq)}\) is oxidized to \(\text{Fe}^{3+}\text{(aq)}\) while \(\text{Cr}_2\text{O}_7^{2-}\text{(aq)}\) is reduced to \(\text{Cr}^{3+}\text{(aq)}\). Which of the following is the balanced net ionic equation for the reaction that occurs in the acidic solution?

- **A.** \(3\text{Fe}^{2+}\text{(aq)} + \text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 14\text{H}^+\text{(aq)} \rightarrow 3\text{Fe}^{3+}\text{(aq)} + 2\text{Cr}^{3+}\text{(aq)} + 7\text{H}_2\text{O(l)}\)
- **B.** \(\text{Fe}^{2+}\text{(aq)} + \text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 14\text{H}^+\text{(aq)} \rightarrow \text{Fe}^{3+}\text{(aq)} + 2\text{Cr}^{3+}\text{(aq)} + 7\text{H}_2\text{O(l)}\)
- **C.** \(6\text{Fe}^{2+}\text{(aq)} + \text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 14\text{H}^+\text{(aq)} \rightarrow 6\text{Fe}^{3+}\text{(aq)} + 2\text{Cr}^{3+}\text{(aq)} + 7\text{H}_2\text{O(l)}\)
- **D.** \(2\text{Fe}^{2+}\text{(aq)} + \text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 14\text{H}^+\text{(aq)} \rightarrow 2\text{Fe}^{3+}\text{(aq)} + 2\text{Cr}^{3+}\text{(aq)} + 7\text{H}_2\text{O(l)}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119689/*