# Re: What is a Gravimetric Factor?

*From*: "Farooq W" <farooq.w@xxxxxxxxx>*Date*: 14 Apr 2005 07:38:29 -0700

c3calvin wrote:

> How can I calculate it?

Gravimetric factors or chemical factors were favourites of classical

analytical chemists. Not much you would find in modern day calculations

or books.

Suppose you wish to determine the amount of iron in a sample. You would

precipitate iron after suitable treatment with reagents in the form of

Fe2O3. You know the formula weight of Fe2O3 is 159 and atomic mass of

Fe is ~ 55:

You can set up a simple relation,

159 g Fe2O3 contains 2 x 55 g Fe

1 g Fe2O3 contains (2 x 55 g)/ 159 g Fe which equals 0.69, this

_number_ is called the gravimetric factor for Fe2O3.

What is utility of this factor, this is left as a question to the OP.

If you are further interested, find more about a "titre" (some sort of

analogue of gravimetric factor).

.

**Follow-Ups**:**Re: What is a Gravimetric Factor?***From:*number6

**References**:**What is a Gravimetric Factor?***From:*c3calvin

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