A 1.04 g sample of KBr is dissolved in water to give 155 mL of solution. This solution is then added to 165 mL of 0.015 M aqueous Pb(NO3)2, in an attempt to remove the toxic lead(II) ions from the solution via precipitation as insoluble PbBr2(s). The precipitation reaction that occurs is: Pb2+(aq) + 2 Br-(aq) → PbBr2(s) 1. What is the ratio of the Pb²+ to Br- concentrations (i.e., Pb²+ : Br¯) present after mixing the two solutions but before the ions start reacting? a) 1.00 : 3.54 b) 1.00 : 2.00 c) 3.73 : 1.00 d) 1.06 : 1.00 2. What is the maximum mass of product that could be isolated by filtration after the reaction occurs? a) 0.513 g b) 0.908 g c) 1.10 g d) 3.21 g At the end of the reaction, what is the concentration (in molarity) of nitrate ions in the solution? Note: there are other ions present too, but you are only asked to think about the NO3 ions here. 3. a) 0.00773 mol·L-1 b) 0.00495 mol·L-1 c) 0.0300 mol·L·1 d) 0.0155 mol·L-1

A 1.04 g sample of KBr is dissolved in water to give 155 mL of solution. This solution is then added to 165 mL of 0.015 M aqueous Pb(NO3)2, in an attempt to remove the toxic lead(II) ions from the solution via precipitation as insoluble PbBr2(s). The precipitation reaction that occurs is: Pb2+(aq) + 2 Br-(aq) → PbBr2(s) 1. What is the ratio of the Pb²+ to Br- concentrations (i.e., Pb²+ : Br¯) present after mixing the two solutions but before the ions start reacting? a) 1.00 : 3.54 b) 1.00 : 2.00 c) 3.73 : 1.00 d) 1.06 : 1.00 2. What is the maximum mass of product that could be isolated by filtration after the reaction occurs? a) 0.513 g b) 0.908 g c) 1.10 g d) 3.21 g At the end of the reaction, what is the concentration (in molarity) of nitrate ions in the solution? Note: there are other ions present too, but you are only asked to think about the NO3 ions here. 3. a) 0.00773 mol·L-1 b) 0.00495 mol·L-1 c) 0.0300 mol·L·1 d) 0.0155 mol·L-1

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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