Consider the following standard cations analyzed in qualitative chemistry: . How many of these belon — Qualitative and Quantitative Analysis Chemistry Question
Question
Consider the following standard cations analyzed in qualitative chemistry: $Ba^{2+}, Sr^{2+}, Ca^{2+}, Mg^{2+}, K^+, Na^+, NH_4^+$. How many of these belong exclusively to Group V of the standard qualitative analysis scheme?
Answer: 3
💡 Solution & Explanation
Group V consists of the alkaline earth metals $Ba^{2+}, Sr^{2+},$ and $Ca^{2+}$. $Mg^{2+}$ belongs to Group VI. $K^+, Na^+,$ and $NH_4^+$ are generally considered Group VI or Zero Group. Thus, exactly 3 cations belong to Group V.
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