ch4 - 4 4.1 4.2 4.3 (a) precipitation 4.4 Reactions in...

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4 Reactions in Aqueous Solution 4.1 (a) precipitation (b) redox (c) acid-base neutralization 4.2 FeBr 3 contains 3 Br ions. The molar concentration of Br ions = 3 x 0.225 M = 0.675 M 4.3 A 2 Y is the strongest electrolyte because it is completely dissociated into ions. A 2 X is the weakest electrolyte because it is the least dissociated of the three substances. 4.4 (a) Ionic equation: 2 Ag + (aq) + 2 NO 3 (aq) + 2 Na + (aq) + CrO 4 2 (aq) Ag 2 CrO 4 (s) + 2 Na + (aq) + 2 NO 3 (aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: 2 Ag + (aq) + CrO 4 2 (aq) Ag 2 CrO 4 (s) (b) Ionic equation: 2 H + (aq) + SO 4 2 (aq) + MgCO 3 (s) H 2 O(l) + CO 2 (g) + Mg 2+ (aq) + SO 4 2 (aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: 2 H + (aq) + MgCO 3 (s) H 2 O(l) + CO 2 (g) + Mg 2+ (aq) (c) Ionic equation: Hg 2 2+ (aq) + 2 NO 3 (aq) + 2 NH 4 + (aq) + 2 Cl(aq) Hg 2 Cl 2 (s) + 2 NH 4 + (aq) + 2 NO 3 (aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: Hg 2 2+ (aq) + 2 Cl(aq) Hg 2 Cl 2 (s) 4.5 (a) CdCO 3 , insoluble (b) MgO, insoluble (c) Na 2 S, soluble (d) PbSO 4 , insoluble (e) (NH 4 ) 3 PO 4 , soluble (f) HgCl 2 , soluble 4.6 (a) Ionic equation: Ni 2+ (aq) + 2 Cl(aq) + 2 NH 4 + (aq) + S 2 (aq) NiS(s) + 2 NH 4 + (aq) + 2 Cl(aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: Ni 2+ (aq) + S 2 (aq) NiS(s) (b) Ionic equation: 2 Na + (aq) + CrO 4 2 (aq) + Pb 2+ (aq) + 2 NO 3 (aq) PbCrO 4 (s) + 2 Na + (aq) + 2 NO 3 (aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: Pb 2+ (aq) + CrO 4 2 (aq) PbCrO 4 (s) (c) Ionic equation: 2 Ag + (aq) + 2 ClO 4 (aq) + Ca 2+ (aq) + 2 Br(aq) 2 AgBr(s) + Ca 2+ (aq) + 2 ClO 4 (aq) Delete spectator ions from the ionic equation, and reduce coefficients to get the net ionic equation. Net ionic equation: Ag + (aq) + Br(aq) AgBr(s) (d) Ionic equation: Zn 2+ (aq) + 2 Cl(aq) + 2 K + (aq) + CO 3 2 (aq) ZnCO 3 (s) + 2 K + (aq) + 2 Cl(aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: Zn 2+ (aq) + CO 3 2 (aq) ZnCO 3 (s) 4.7 3 CaCl 2 (aq) + 2 Na 3 PO 4 (aq) Ca 3 (PO 4 ) 2 (s) + 6 NaCl(aq) Ionic equation: 65
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3 Ca 2+ (aq) + 6 Cl(aq) + 6 Na + (aq) + 2 PO 4 3 (aq) Ca 3 (PO 4 ) 2 (s) + 6 Na + (aq) + 6 Cl(aq) Delete spectator ions from the ionic equation to get the net ionic equation. Net ionic equation: 3 Ca 2+ (aq) + 2 PO 4 3 (aq) Ca 3 (PO 4 ) 2 (s) 4.8 A precipitate results from the reaction. The precipitate contains cations and anions in a 3:2 ratio. The precipitate is either Mg 3 (PO 4 ) 2 or Zn 3 (PO 4 ) 2 . 4.9
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ch4 - 4 4.1 4.2 4.3 (a) precipitation 4.4 Reactions in...

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