Five students (Alexander, Benjamin, Cierra, Drew, and Erin) are given unknown aq
ID: 692578 • Letter: F
Question
Five students (Alexander, Benjamin, Cierra, Drew, and Erin) are given unknown aqueous solutions, each containing a different ionic compound. The ionic compounds contain ammonium, calcium, nickel, potassium, or zinc as the cation and bromide, fluoride, hydroxide, nitrate, or sulfate as the anion. No single ion is repeated. Using the clues below, determine the ionic compound contained in each student's solution and its molar mass. 1. Benjamin's compound has a molar mass greater than that of the one containing the hydroxide ion, but smaller than the one containing the ammonium ion. The compound with the largest molar mass has a cation:anion ratio of 1:2. 2. Cierra's compound formed a precipitate when aqueous sodium carbonate was added. The compound with the middle value for molar mass did not contain a divalent cation. The compound with the second smallest molar mass formed a precipitate with aqueous barium iodide. 3. The molar mass of Drew's compound is between 50 and 100 grams per mole greater than the compound containing nickel. One compound had a cation:anion ratio of 2:1. 4. Alexander's compound contains all polyatomic ions. Erin has the compound with the smallest molar mass. 5. Benjamin's compound contains a transition metal. The compound containing zinc had the largest molar mass. The compound with the second largest molar mass formed a precipitate when aqueous lithium sulfate was added. 6. A precipitate was formed when a solution of iron(II) chloride was added to the solution containing the compound with the smallest molar mass. The largest molar mass of a compound is over 200 grams per mole le 2- Logic Puzzle Solving Grid Table 1. Solubility Chart for Combinations of lons Molar Mass Anion lons Cierta Drew Erin Chloride 0q 0 0q5 00 0 0 0bromide Fluoride aq Sss aq aq aq oq fluoride sulfate Phosphate 0qssSSq 0q SulfateExplanation / Answer
Qualitative analysis of solutions.
Prediction of compounds
1. having cation to anion ratio as 1 : 2 - could be CaF2, CaBr2, Ca(NO3)2, NiCl2, NiBr2, Ni(NO3)2, ZnCl2, ZnBr2, Zn(NO3)2
2. formed precipitate with sodium carbonate - could be Ca2+, Zn2+ or Ni2+.
forms precipitate with barium iodide - SO4^2- present
3. Compound has cation : anion ratio = 2 :1 - K2SO4 present
4. contains polyvalent ions - could be CaSO4, ZnSO4 or NiSO4
5. forms precipitate with Li2SO4 - Ca2+ present
transition metal containing compound - Ni(NO3)2, other compound Zn(NO3)2
6. forms precipitate upon addition of Fe(II)chloride - F- present
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