Question

drag the appropriate items to their respective bins.
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cu₃(po₄)₂ pbso₄ na₃po₄ pbcl₂
soluble insoluble

Explanation:

Step1: Recall Solubility Rules

• Salts of Group 1 metals (like Na⁺) are soluble. So \( \text{Na}_3\text{PO}_4 \) (sodium phosphate) is soluble.
• Phosphates (\( \text{PO}_4^{3-} \)) are generally insoluble, except with Group 1 metals or ammonium. So \( \text{Cu}_3(\text{PO}_4)_2 \) (copper(II) phosphate) is insoluble.
• Sulfates (\( \text{SO}_4^{2-} \)) are generally soluble, but lead(II) sulfate (\( \text{PbSO}_4 \)) is an exception (insoluble).
• Chlorides (\( \text{Cl}^- \)) are generally soluble, but lead(II) chloride (\( \text{PbCl}_2 \)) is insoluble in cold water (or under typical conditions for such problems).

Step2: Categorize Each Compound

• Soluble: \( \text{Na}_3\text{PO}_4 \) (due to Na⁺, a Group 1 metal).
• Insoluble: \( \text{Cu}_3(\text{PO}_4)_2 \) (phosphate, not Group 1/ammonium), \( \text{PbSO}_4 \) (lead sulfate, sulfate exception), \( \text{PbCl}_2 \) (lead chloride, chloride exception).

Answer:

Soluble: \( \text{Na}_3\text{PO}_4 \)
Insoluble: \( \text{Cu}_3(\text{PO}_4)_2 \), \( \text{PbSO}_4 \), \( \text{PbCl}_2 \)