I. Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide. Below is an unbalanced net ionic equation of the reaction:                      Pb2+ (aq) + I-1 (aq)  →  PbI2 (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  45.0 g of  Pb(NO3)2 (aq) to completely precipitate the lead?

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
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I. Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide. Below is an unbalanced net ionic equation of the reaction:
                     Pb2+ (aq) + I-1 (aq)  →  PbI2 (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  45.0 g of  Pb(NO3)2 (aq) to completely precipitate the lead?
 
II. Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 3.86 g of magnesium ribbon burns with 155ml of oxygen at 1.0 atm and 275 K , a bright, white light and a white, powdery product is formed, magnesium oxide. How many grams of excess reactant remain?
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