Basic Gravimetric Reactions

grams --> moles ---> moles ---> grams

Look at Table 5-4 from SWH 7th

(Some Excerpts)
 
Measure Precipitating Using
Be BeO NH3
Mg Mg2P2O7 (NH4)2HPO4
Cl AgCl AgNO3
PO43- Mg2P2O7 MgCl2, NH4Cl

We want percent (w/w) in an unknown.

Given grams of sample and grams of precipitating product, compute %.