it's properties and composition MUXRO 21 



Considering Guichard's formula — 



IM05O14, 6H2 O it is calculated that residue should weigh 



Mo- 



X . 2669 g = . 1980 g. This 10% too great. 



Mos 0,4 6 H2 O 



The "loss in weight" as calculated by the formula, would 

 be correspondingly small. 



The formula given in Zsigmondy's "Colloids" is 

 MojOg, 5H2 O. This would give a residue weighing .1517 g, 

 as calculated by 



M03 288 



= -—X. 2669 =.1517 g, or 85.1% of experi- 



M03O8 5 H3O 506 

 mental value. 



According to this formula the weight of gas and water- 



O 5 H O 218 



vapor given off would be — — X . 2669 = — — X . 2669 = 



M03 Og SH2 O 506 



.1150 g, which is over 10% greater than experimental value. 

 The formula most generally given is MojOg. According to 



this the residue would be — ^ — ^ X . 2669 = — 7 X . 2669 = 1848g 



M03 Og 416 



This is 3.5% greater than actual weight of residue. 

 Calculating the weight of oxygen given off; weight of 



Og 128 



oxygen equals — — X . 2669 = —zX. 2669 = . 083 1 g. 



M03 Og 416 



which is 6|% less than the "loss in weight" of sample. 



From the relation of weight of residue and weight of gas 

 given off, it was thought that the formula would be MojOg H^ O. 



Calculations were made. 



Weights of residue equals — 



Mo. 288 



X. 2669 = —-X. 2669 =.1771 g. 



M03O8H2O 434 



