Chemistry Help!!?

Posted on 2015-10-09 05:58:00 in Chemistry by NICKY

M+ is an unknown metal cation with a +1 charge. A student dissolves the chloride of the unknown metal, MCl, in enough water to make 100.0 mL of solution. The student then mixes the solution with excess AgNO3 solution, causing AgCl to precipitate. The student collects the precipitate by filtration, dries it, and records the data shown below. (The molar mass of AgCl is 143 g / mol.)

Mass of unknown chloride, MCl=0.74 g
Mass of filter paper=0.80 g
Mass of filter paper plus AgCl precipitate=2.23 g

1. What is the identity of the metal chloride?
a. NaCl
b. KCl
c. CuCl
d. LiCl

2. During the course of the experiment, which of the following happens to the NO3- ions?
a. They are oxidized by Cl- ions.
b. They are reduced to NO2- ioins.
c. They are decomposed by reacting to M+ ions.

I know the answer for number 1 is b, but I dont know the answer for number 2, or how to go about it?
Can someone please help me with an explanation??

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