(3) 'Sand. 



Crucible + lid + sand ... ... 29-3955 



Crucible + Hd alone ... ... 29-3290 



0665 

 Less paper ash ... -0020 



. ' 6 45 



(4) Total Lime ( Calcium Carbonate). 



Crucible 4- precipitate and paper ash ... =29-76625 



Crucible alone... =29-32800 



43825 

 Less paper ash ... -00200 



43625 



=43-63% 

 (5) Total phosphates, 



Crucible-f Mg 2 P 2 C>7 ... =29-545 



Crucible alone ... ... =29-328 



.. ... -217 



Deduct paper ash ... -002 



215 =21-5% 

 Precipitated phosphates in the soluble portion. 



Crucible + Mg 2 P 2 C>7 ... =29-520 



Crucible alone ... ... =29-328 



'192 

 Deduct ash ... ='002 



i9 =19 



To calculate the Monocaldum phosphate.* 

 CaH 4 P 2 O 8 + 4NH 4 HO + (NH 4 ) 2 C 2 4 = CaC 2 O 4 + 2(NH 4 ) 3 PO 4 . 



