A horizontal micro-burette

Abstract

A simple micro-burette, constructed from graduated thermometer tubing, pyrex tubing and taps, and delivering volumes of the order 0.1 ml. with a coeff. of variation of 0.12 (this is also the error of delivering 1 ml. from a standard 2 cc. Bang burette) may be substituted for this burette and permits the use of fluids 10 times more conc. which have been in contact only with pyrex or paraffined walls. It is more accurate than the Bang burette when titrating quantities of acid 10-6 equivalent or less, being then as accurate as the Rehberg burette. The error of titrating 1 ml. of 0.0002 N H2SO4 in air is 1.7 X 10-4 expressed as a standard deviation in millimols of alkali.