A solution is believed to contain one or more of the following ions: Cr³⁺, Zn²⁺, Fe³⁺, Ni²⁺. When the solution is treated with excess NaOH(aq), a precipitate forms. The solution in contact with the precipitate is colorless. The precipitate is dissolved in HCl(aq), and the resulting solution is treated with NH₃(aq). No precipitation occurs. Based solely on these observations, what conclusions can you draw about the ions present in the original solution? That is, which ion(s) are likely present, which are most likely not present, and about which can we not be certain? Refer to Appendix D for solubility product and complex-ion formation data.

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TABLE D.1 Ground-State Electron Configurations Element Configuration Z Z 1 2 3 4 6 7 8 9 5 B 10 11 12 13 14 15 16 17 18 19 20 25 27 29 HIGÅMUZONSUZ SE> 0 ≤ 2 3 2 3 5 3 3 4 8 5 2 30 Η 31 He 32 Li 33 Be C F Ne Na Mg Al 21 Sc 22 Ti 23 V 24 Si P CI Ar 26 Fe K Ca 28 Ni Cr Mn Co Cu Zn Ga Ge As 34 Se 35 Br 36 Kr 1s¹ 1s² [He] 2s¹ [He] 2s2 [He] 2s²2p¹ [He] 2s²2p² [He] 2s²2p³ [He] 2s22p4 [He] 2s²2p5 [He] 2s²2p6 [Ne] 3s¹ [Ne] 3s2 [Ne] 3s 3p¹ [Ne] 3s23p² 37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb Te 52 53 I 54 Xe 55 Cs 56 Ba 57 La 58 Ce 59 Pr [Ar] 3d³4s² [Ar] 3d54s¹ 60 Nd 61 Pm 62 Sm 63 Eu [Ar] 3d³4s² [Ar]3d64s² [Ar]3d²4s² [Ar]3d845² [Ar] 3d¹04s¹ [Ar] 3d¹04s2 64 Gd 65 Tb 66 67 [Ar] 3d¹04s²4p¹ Dy Ho Er 69 Tm [Ar] 3d¹04s²4p² 68 [Ar]3d¹04s²4p³ [Ar] 3d¹04s²4p4 70 Yb Lu [Ne] 3s²3p³ [Ne] 3s23p4 [Ne] 3s 3p5 [Ne] 3s 3p6 [Ar] 4s¹ [Ar] 4s² [Ar]3d¹4s² [Ar]3d²4s² [Ar]3d¹04s²4p5 71 Element [Ar]3d¹04s²4p6 Configuration Z [Kr] 5s¹ [Kr] 5s² [Kr] 4d¹5s² [Kr] 4d²5s² [Kr] 4d45s¹ [Kr] 4d55s¹ [kr] 4d55s² [Kr] 4d75s¹ [Kr] 4d85s1 [Kr] 4d10 [Kr] 4d105s1 [Kr] 4d¹05s² [Kr] 4d¹05s²5p¹ [Kr] 4d¹05s25p² [Kr] 4d¹05s²5p³ [kr] 4d¹05s25p4 [Xe] 6s² [Xe] 5d¹6s² [Xe] 4f²6s² [Xe] 4f³6s² [Xe] 4f46s2 [Xe] 4f6s2 [Xe] 4f6s2 [Xe] 4f76s2 [Xe] 4f75d¹6s² [Xe] 4f%s2 [Xe] 4f106s2 [Xe] 4f¹¹6s² NRNKERKR [Xe] 4f126s2 [Xe] 4f136s2 [Xe] 4f146s2 [Xe] 4f¹45d¹6s² 72 Hf 73 Ta W 74 75 Re 76 Os 77 Element 78 79 80 81 82 83 84 85 86 87 Fr [Kr] 4d¹05s²5p5 88 Ra [Kr] 4d¹05s²5p6 89 Ac [Xe] 6s¹ 90 Th 91 92 93 94 95 96 97 98 99 Ir Pt Au Hg TI Pb Bi Po At Rn Pa U Np Pu Am Cm Bk Cf Es 100 Fm 101 Md 102 No 103 Lr 104 Rf 105 Db 106 Sg Configuration [Xe] 4f¹45d²6s² [Xe] 4f145d³6s² [Xe] 4f145d46s2 [Xe] 4f145d56s2 [Xe] 4f145d6s2 [Xe] 4f¹45d²6s² [Xe] 4f¹45dº6s¹ [Xe] 4f145d106s1 [Xe] 4f145d106s2 [Xe] 4f145d6s26p* [Xe] 4f145d106s36p? [Xe] 4f145d16s?6p3 [Xe] 4f145d6s®6p* [Xe] 4f145d16s26p5 [Xe] 4f145d106s26p6 [Rn] 7s¹ [Rn] 7s² [Rn] 6d¹7s² [Rn] 6d²7s² [Rn] 5f26d¹7s² [Rn] 5f³6d¹7s² [Rn] 5f46d¹7s2 [Rn] 5f67s² [Rn] 5f77s² [Rn] 5f76d¹7s² [Rn] 5f97s2 [Rn] 5f107,2 [Rn] 5f117s2 [Rn] 5f¹27s² [Rn] 5f137,2 [Rn] 5f147s2 Rn] 5f¹46d¹7s² [Rn] 5f¹46d²7s² [Rn] 5f¹46d³7s2 [Rn] 5f¹46d¹7s²