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The solublity rules for ionic compounds are shown in the textbook on page 330. However, as you know, you can't bring the textbook with you to exams. The solubility rules are also shown on the bottom of the Exam Information Sheet. Because this is a tool that you CAN access during excams, you need to practice using these solubility nules. Using the solubility rules on the Exam Information Sheet, predict whether the following compounds are soluble or insoluble in water. Use the drop-down menus provided. NIS | [ Select ] Mg3(POs)2 Select ) Li2CO3 ISelect ] NH4CI I Select ) 1 pts D Question 6 Which of the following best describes the solute in an aqueous solution of sucrose or C12H2201 (aq)? o c4t H' and o? ions C, H and O atoms C12H22011 molecules C atoms and H20 molecules

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Answer:

NiS insoluble

Mg₃(PO₄)₂ insoluble

Li₂CO₃ soluble

NH₄Cl soluble

C₁₂H₂₂O₁₁ molecules

Explanation:

Predict whether the following compounds are soluble or insoluble in water.

Based on the solubility rules we can say:

  • NiS: Sulfides of transition metals are highly insoluble.
  • Mg₃(PO₄)₂: All phosphates (except those with metals of Group 1) are insoluble so Mg₃(PO₄)₂ is insoluble.
  • Li₂CO₃: all salts of metals of Group 1 are soluble so Li₂CO₃ is soluble.
  • NH₄Cl: all salts of ammonium are soluble so NH₄Cl is soluble.

Which of the following best describes the solute in an aqueous solution of sucrose or C₁₂H₂₂O₁₁(aq)?

Sucrose is a molecular compound in which atoms are linked through covalent bonds. Thus, it does not ionize in water (is a non-electrolyte) and when it dissolves it exists as C₁₂H₂₂O₁₁ molecules.

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