xxii CONTENTS 



Nitrates and Nitrites. 



PAGE 



216. Estimation of Nitrites ..... 223 



217. Griess-IIosvay Method ..... 224 



218. Total Nitrates and Nitrites . . . . 224 



Chlorides. 



219. Determination of Chlorides .... 226 



Acidity in Water. 



220. Total Acidity and Residual Acidity . . . 226 



Estimation of Lead. 



221. Qualitative Determination and Quantitative Estima- 



tion ....... 228 



Estimation of Hardness. 



222. Estimation of Hardness by Soap Solution— Table of 



Hardness ...... 229 



CHAPTER XXIII 

 Softening Water for Sprays— Soft Soaps 



223. Use of Washing-soda ..... 233 



224. Examination of Soft Soap .... 234 



Index 



23s 



