SOLVED

81) The mixing of which pair of reactants will result in a precipitation reaction? A) Mg(NO3)2(aq) + Na2CO3(aq) B) K2SO4(aq) + Cu(NO3)2(aq) C) NaClO4(aq) + (NH4)2S(aq) D) NH4Br(aq) + NH4I(aq) 82) What reagent could be used to separate Br- from N O3- when added to an aqueous solution containing both? A) AgNO3(aq) B) Ba(OH)2(aq) C) CuSO4(aq) D) NaI(aq) 83) What reagent could not be used to separate I- from OH – when added to an aqueous solution containing both? A) AgNO3(aq) B) Ca(NO3)2(aq) C) Cu(NO3)2(aq) D) Fe(NO3)2(aq) 84) Which of the following is a precipitation reaction? A) Zn(s) + 2 AgNO3(aq) → 2 Ag(s) + Zn(NO3)2(aq) B) KCl(aq) + LiI(aq) → KI(aq) + LiCl(aq) C) 2 KI(aq) + Hg2(NO3)2(aq) → Hg2I2(s) + 2 KNO3(aq) D) HCl(aq) + LiOH(aq) → LiCl(aq) + H2O(l) E) None of the above are precipitation reactions. 85) Which of the following pairs of aqueous solutions will form a precipitate when mixed? A) HF+ LiOH B) Li2S + HF C) K2CO3 + HNO3 D) MgCl2 + KOH E) All of these solution pairs will produce a precipitate. 86) Which of the following pairs of aqueous solutions will form a precipitate when mixed? A) K2CO3 + NaBr B) Na2 SO4 + LiOH C) CaS + Na2SO4 D) None of these solution pairs will produce a precipitate. E) All of these solution pairs will produce a precipitate. 87) Which of the following pairs of aqueous solutions will form a precipitate when mixed? A) NH4NO3 + Na2CO3 B) Hg2(NO3)2 + LiCl C) NaCl + Li3PO4 D) AgC2H3O2 + Cu(NO3)2 E) None of the above solution pairs will produce a precipitate. 88) Which of the following pairs of aqueous solutions will form a precipitate when mixed? A) KOH + Li2S B) (NH4)2SO4 + LiCl C) Sr(C2H3O2)2 + Li2SO4 D) KNO3 + LiOH E) None of the above solution pairs will produce a precipitate. 89) Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: (aq) + (aq) → (s) Lead iodide is virtually insoluble in water so that the reaction appears to go to completion. How many milliliters of 3.550 M HI(aq) must be added to a solution containing 0.500 mol of to completely precipitate the lead? A) 3.55 × 10-3 mL B) 282 mL C) 141 mL D) 0.141 mL E) 0.282 mL 90) Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride: (aq) + (aq) → AgCl(s) Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.175 M solution to completely precipitate the silver? A) 4.38 × g B) 7.49 × 10-5 g C) 0.256 g D) 0.0749 g E) 1.34 × 104 g