Untitled - Kelly Walsh High School

274 CHEMISTRY FOR THE UTTERLY CONFUSED
The SI base unit for electric current is the ampere (A). In addition to being an
SI base unit, an ampere is a coulomb (C) per second, and a faraday is 96485 C/mol
of electrons. Therefore:
If liquid titanium(IV) chloride (acidified with HCl) is electrolyzed by a current of
1.000 A for 2 h, how many grams of titanium will be produced?
Solution:
First, write the half-reaction. Ti 4 (l) 4 e l Ti(s)
The information from the problem and the half-reaction are:
Ti4 (l) 4 e l Ti(s)
2.000 h
1.000 A
? grams
To simplify the solution we will write amperes as its definition of coulomb/second.
Grams Ti
1A 1C
1s
0.89305073 0.8930 g Ti
and 1 faraday 1F
3600 s C
1 mol mol Ti g Ti
(2.000 h) a ba1.000
1h s ba ba1 ba47.87
96485 C 4 mol 1 mol Ti b
18-6 Utterly Confused About Electrolysis
One way to represent an electrolysis reaction is:
electrolysis
2 KF(l) 4 2 K(l) F2(g) In this reaction the cathode and anode reactions are:
Cathode K 1e l K
Anode 2 F l F2 2 e 96485 C
1 mol electrons