Determination of an Equilibrium Constant 1) If 20.0 mL of 0.00200 M Fe(No3)3 is diluted to...
Determination of an Equilibrium Constant
1) If 20.0 mL of 0.00200 M Fe(No3)3 is diluted to 50.0 mL, what is the concentration of Fe^+3 in the diluted solution?
2) Write the equilibrium for the following reaction.
Co^+2 +4SCN^-1 <--> Co(SCN)4 ^-2
3) How many mmoles of SCN^-1 ion are there in 3.0 mL of 0.00200 M KSCN?
Homework Answers
1) If 20.0 mL of 0.00200 M Fe(No3)3 is diluted to 50.0 mL, what is the concentration of Fe^+3 in the diluted solution
The initial concentration of Fe(No3)3 is 0.02 M and the volume 20mL
If it is diluted to 50mL then the concentration can be calculated as
M1V1 = M2V2
0.002 X 20 = M2 X 50
M2 = Final concentration = 0.0008 M
2) Write the equilibrium for the following reaction.
Co^+2 +4SCN^-1 <--> Co(SCN)4 ^-2
Kc = [Co(SCN)4-2] / [Co+2 ] [SCN-1]4
3) millimoles of SCN-1 = molarity X volume = 0.002 X 3 = 0.006 millimoles
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