Question

A student is provided with an unknown solution, which will contain one of the following cations: Sr$^{2+}$ (aq), Cu$^{2+}$ (aq), Pb$^{2+}$ (aq), or K$^{+}$ (aq). The unknown solution is mixed with aqueous sodium bromide, sodium hydroxide, and sodium sulfate. The student's observations are shown below. \begin{tabular}{|c|c|c|} \hline NaBr (aq) & NaOH (aq) & Na$_2$SO$_4$ (aq) \\ \hline Unknown solution & no change & precipitate & no change \\ \hline \end{tabular} Which cation does the unknown solution contain? Select the single best answer. Note: Reference the Solubility of ionic compounds in water table for additional information. Potassium ion, K$^{+}$ (aq) Lead(II) ion, Pb$^{2+}$ (aq) Strontium ion, Sr$^{2+}$ (aq) Copper(II) ion, Cu$^{2+}$ (aq)

          A student is provided with an unknown solution, which will contain one of the following cations: Sr$^{2+}$ (aq), Cu$^{2+}$ (aq), Pb$^{2+}$ (aq), or K$^{+}$ (aq).
The unknown solution is mixed with aqueous sodium bromide, sodium hydroxide, and sodium sulfate. The student's observations are shown below.
\begin{tabular}{|c|c|c|}
\hline
NaBr (aq) & NaOH (aq) & Na$_2$SO$_4$ (aq) \\
\hline
Unknown solution & no change & precipitate & no change \\
\hline
\end{tabular}
Which cation does the unknown solution contain? Select the single best answer.
Note: Reference the Solubility of ionic compounds in water table for additional information.
Potassium ion, K$^{+}$ (aq)
Lead(II) ion, Pb$^{2+}$ (aq)
Strontium ion, Sr$^{2+}$ (aq)
Copper(II) ion, Cu$^{2+}$ (aq)

A student is provided with an unknown solution, which will contain one of the following cations: Sr^2+ (aq), Cu^2+ (aq), Pb^2+ (aq), or K^+ (aq).
The unknown solution is mixed with aqueous sodium bromide, sodium hydroxide, and sodium sulfate. The student's observations are shown below.

NaBr (aq) NaOH (aq) Na2SO4 (aq)

Unknown solution no change precipitate no change

Which cation does the unknown solution contain? Select the single best answer.
Note: Reference the Solubility of ionic compounds in water table for additional information.
Potassium ion, K^+ (aq)
Lead(II) ion, Pb^2+ (aq)
Strontium ion, Sr^2+ (aq)
Copper(II) ion, Cu^2+ (aq)

Added by Nicole B.

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