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title: "A student determines the concentration of an unknown solution of \\(\\text{CuSO}_4\\text{(aq)}\\) using a spectrophotometer set to a wavelength of \\(635\\text{ nm}\\). First, the student measures the absorbance of a \\(2.0 \\times 10^{-3}\\text{ M}\\) standard \\(\\text{CuSO}_4\\text{(aq)}\\) solution in a cuvette with a path length of \\(0.50\\text{ cm}\\), obtaining an absorbance of \\(0.20\\). Next, the student measures the absorbance of the unknown \\(\\text{CuSO}_4\\text{(aq)}\\) solution in a standard cuvette with a path length of \\(1.0\\text{ cm}\\) and records an absorbance of \\(0.60\\). Based on these data, what is the molar concentration of the unknown \\(\\text{CuSO}_4\\text{(aq)}\\) solution?"
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url: "https://nerd-notes.com/ubq/119164/"
date_modified: "2026-08-19T12:32:35+00:00"
---

# A student determines the concentration of an unknown solution of \(\text{CuSO}_4\text{(aq)}\) using a spectrophotometer set to a wavelength of \(635\text{ nm}\). First, the student measures the absorbance of a \(2.0 \times 10^{-3}\text{ M}\) standard \(\text{CuSO}_4\text{(aq)}\) solution in a cuvette with a path length of \(0.50\text{ cm}\), obtaining an absorbance of \(0.20\). Next, the student measures the absorbance of the unknown \(\text{CuSO}_4\text{(aq)}\) solution in a standard cuvette with a path length of \(1.0\text{ cm}\) and records an absorbance of \(0.60\). Based on these data, what is the molar concentration of the unknown \(\text{CuSO}_4\text{(aq)}\) solution?

A student determines the concentration of an unknown solution of \(\text{CuSO}_4\text{(aq)}\) using a spectrophotometer set to a wavelength of \(635\text{ nm}\). First, the student measures the absorbance of a \(2.0 \times 10^{-3}\text{ M}\) standard \(\text{CuSO}_4\text{(aq)}\) solution in a cuvette with a path length of \(0.50\text{ cm}\), obtaining an absorbance of \(0.20\). Next, the student measures the absorbance of the unknown \(\text{CuSO}_4\text{(aq)}\) solution in a standard cuvette with a path length of \(1.0\text{ cm}\) and records an absorbance of \(0.60\). Based on these data, what is the molar concentration of the unknown \(\text{CuSO}_4\text{(aq)}\) solution?

- **A.** \(1.5 \times 10^{-3}\text{ M}\)
- **B.** \(3.0 \times 10^{-3}\text{ M}\)
- **C.** \(6.0 \times 10^{-3}\text{ M}\)
- **D.** \(1.2 \times 10^{-2}\text{ M}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119164/*