\begin{tabular}{|l|l|l|}
\hline Trial & {$\left[\mathrm{Cu}^{2+} ight]$} & Absorbance \
\hline 1 & 0.025 & 0.124 \
\hline 2 & 0.050 & 0.268 \
\hline 3 & 0.100 & 0.520 \
\hline 4 & 0.150 & 0.680 \
\hline
\end{tabular}

Using a spectrophotometer, a student measures the absorbance of four solutions of $\mathrm{CuSO}_{4}$ at a given wavelength. The collected data is given in the table above. Which of the following is the most likely explanation for the discrepant data in trial 4 ?
(A) The solution was at a lower temperature than the solutions in the other trials.
(B) The measurement was made using a different spectrophotometer that uses a cell with a longer path length.
C) The solution was saturated and the flow of light through the solution was restricted.
(D) The concentration of the solution was actually lower than $0.150 \mathrm{M}$.

Question

\begin{tabular}{|l|l|l|}
\hline Trial & {$\left[\mathrm{Cu}^{2+}ight]$} & Absorbance \
\hline 1 & 0.025 & 0.124 \
\hline 2 & 0.050 & 0.268 \
\hline 3 & 0.100 & 0.520 \
\hline 4 & 0.150 & 0.680 \
\hline
\end{tabular}

Using a spectrophotometer, a student measures the absorbance of four solutions of $\mathrm{CuSO}_{4}$ at a given wavelength. The collected data is given in the table above. Which of the following is the most likely explanation for the discrepant data in trial 4 ?
(A) The solution was at a lower temperature than the solutions in the other trials.
(B) The measurement was made using a different spectrophotometer that uses a cell with a longer path length.
C) The solution was saturated and the flow of light through the solution was restricted.
(D) The concentration of the solution was actually lower than $0.150 \mathrm{M}$.

Accepted Answer

***B*** ∻Key Concept∻ ⚹Path length in spectrophotometry⚹ ∻Explanation∻ ⚹The absorbance of a solution in spectrophotometry is directly proportional to the path length of the cell used. If a different spectrophotometer with a longer path length was used for Trial 4, it would result in a higher absorbance reading, explaining the discrepancy.⚹◊What is the relationship between the concentration of $Cu^{2+}$ and the absorbance values in the spectrophotometer measurements⍭ Generate me a similar question◊

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