Question
What is the standard concentration of FeSCN^2+ if 18mL of 0.200M Fe(NO3)3 were combined with 2mL of 0.0020M KSCN?
Answers
DrBob222
KSCN + Fe^3+ ==> FeSCN^2+
KSCN = 0.2 x 18/20 = 0.18 M
Fe^3+ = 0.002 x 2/20 = 0.0002 M
So FeSCN^2+ must be 0.0002 M
You can make an ICE chart for that if you wish to see it better.
......KSCN + Fe^3+ ==> FeSCN^2+
I.....0.18...............0
add........0.0002............
C.-0.0002..-0.0002.....0.0002
E....about 0.18..0.....0.0002
KSCN = 0.2 x 18/20 = 0.18 M
Fe^3+ = 0.002 x 2/20 = 0.0002 M
So FeSCN^2+ must be 0.0002 M
You can make an ICE chart for that if you wish to see it better.
......KSCN + Fe^3+ ==> FeSCN^2+
I.....0.18...............0
add........0.0002............
C.-0.0002..-0.0002.....0.0002
E....about 0.18..0.....0.0002