May 28, 2023, 12:32:14 PM
Forum Rules: Read This Before Posting

### Topic: Given Fe2(SO4)3 2%(w/w) , does that mean this is the %(w/w) of two Fe?  (Read 4554 times)

0 Members and 1 Guest are viewing this topic.

#### 123hello123

• Very New Member
• Posts: 2
• Mole Snacks: +0/-0
##### Given Fe2(SO4)3 2%(w/w) , does that mean this is the %(w/w) of two Fe?
« on: April 21, 2012, 08:47:43 PM »
If it does, does that mean my results (about 3.7) is correct (this is the amount of Fe only, not Fe2(SO4)3)- due to some spillage, I know that it should be under 2%(w/w).

#### Arkcon

• Retired Staff
• Sr. Member
• Posts: 7367
• Mole Snacks: +533/-147
##### Re: Given Fe2(SO4)3 2%(w/w) , does that mean this is the %(w/w) of two Fe?
« Reply #1 on: April 21, 2012, 09:20:10 PM »
If the label doesn't say x% Fe, then it means the sample is 2% Fe2(SO4)3 and 98% dirt or powdered stone or something.  I don't know how you've computed the Fe amount, but you have to compensate as above.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

#### 123hello123

• Very New Member
• Posts: 2
• Mole Snacks: +0/-0
##### Re: Given Fe2(SO4)3 2%(w/w) , does that mean this is the %(w/w) of two Fe?
« Reply #2 on: April 21, 2012, 09:26:02 PM »
I'm a little confused as to what you mean. I wanted to know, with 2%(w/w) Fe2(SO4)3 in mind, if the amount of Fe that I calculated is sensible? I used UV-vis spec. to get my raw data.

#### Arkcon

• Retired Staff
• Sr. Member
• Posts: 7367
• Mole Snacks: +533/-147
##### Re: Given Fe2(SO4)3 2%(w/w) , does that mean this is the %(w/w) of two Fe?
« Reply #3 on: April 21, 2012, 10:51:33 PM »
Ah.  Sorry, I got it backwards.  OK, experimentally, you've determined the Fe concentration is 2%. Now you want to report % Fe2(SO4)3?  Yeah, you will have to convert that.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.