An Examination of some Methods Employed in Determining the Atomic Weight of Cadmium.

A Thesis

Presented to the Board of University Studies of the Johns Hopkins University for the Degree of Doctor of Philosophy.

John E. Bucher.

1894

Contents.

I.	Introduction and Historical Statement		[1]
II.	The Oxalate Method		[3]
		Preparation of Pure Cadmium	[3]
		Preparation of Nitric Acid	[4]
		Purification of Water	[4]
		Purification of Oxalic Acid	[5]
		Preparation of Cadmium Oxalate	[7]
		Procedure	[8]
		Results	[13]
III.	The Sulphide Method		[16]
		Preparation of Hydrogen Sulphide	[16]
		Preparation of Nitrogen	[17]
		Mode of Procedure	[18]
		Results	[24]
		Discussion of the Results	[24]
		Discussion of the Method	[26]
IV.	The Chloride Method		[33]
		Preparation of Cadmium Chloride	[35]
		The Filters	[48]
		Analytical Process	[52]
		Results	[57]
		Discussion of the Results	[58]
V.	The Bromide Method		[69]
		Preparation of Cadmium Bromide and Hydrobromic Acid	[70]
		Method of Analysis	[78]
		Results	[80]
		Discussion of the Results	[80]
VI.	Syntheses of Cadmium Sulphate		[82]
		Results	[90]
		Discussion of the Results	[91]
VII.	The Oxide Method		[94]
		Results	[96]
		Discussion of the Results	[97]
		Determination of Error	[104]
		Discussion of the Oxalate Method	[114]
VIII.	Other Methods		[119]
IX.	Conclusion		[122]