Assignment:
Question 1. Write balanced molecular and net ionic equations for the reactions of a) m
a) hydrochloric acid with nickel
b) dilute sulfuric acid with iron
c) hydrobromic acid with magnesium
d) acetic acid,HC2H3O2 with zinc
Question 2. Hard water contains Ca2+, Mg2+, and Fe2+, which interfere with the action of soap and leave an insoluble coating on the insides of containers and pipes when heated. Water softeners replaced these ions with Na+. If 1.0X10^3L of hard water contains 0.010 M Ca2+ and 0.0050M Mg2+, how many moles of Na+ are needed to replace these ions?
Question 3. The Arsenic in a 1.22g sample of a pesticide was converted to AsO4^3- by suitable chemical treatment. It was then titrated with Ag+ to form Ag3AsO4 as a precipitate.
a) What is the oxidation state of As in AsO4^3-?
b) Name Ag3AsO4 by analogy to the corresponding compound containing phosphorus in place of arsenic.
c) If it took 25.0ml of 0.102 M Ag+ to reach the equivalent point in this titration, what is the mass percentage of arsenic in the pesticide?
Provide complete and step by step solution for the question and show calculations and use formulas.