Go Back   Chemistry Help Forum > Chemistry Forums > Undergraduate Chemistry Forum

Undergraduate Chemistry Forum Ask your undergraduate chemistry questions here.

Reply
 
Thread Tools Display Modes
Old Jan 25th 2015, 10:08 AM   #1
Naty1012
Junior Member
 
Join Date: Jan 2015
Posts: 1
Naty1012 is on a distinguished road
How to calculate amount of Fe in a vitamin tablet

Using the equation from the standards I obtained I calculated the concentration of the unknown to be
C =1.941x10^-6 mol/L.
DF=100
Vtotal = 100mL
MWFe = 55.845g/mol
mass of sample = 1.4375g

1.941x10^-6mol/L x100
= 1.941x10^-4 mol/L x 0.1L
= 1.941x10^-5 mol x 55.8452g = 1.08mg

This is what I calculated so far but I don't think I did this correctly. I am not sure if I should use the mass of the sample. I noticed online that others use the total mass of the tablet however for us the tablet was already crushed so we used everything in the vial, 1.4375g. So I am not sure what to do now.

I would greatly appreciate the help. Thank you.
Naty1012 is offline   Reply With Quote
Reply

  Chemistry Help Forum > Chemistry Forums > Undergraduate Chemistry Forum

Tags
mass of iron



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed