Sentence:  The <WSD>mixture</WSD> was then extracted with alkali and with water following which the carbon tetrachloride was distilled on a Vigreux column , a 25 % center cut being retained which was then degassed under vacuum in the presence of * * f . 
Meaning of the word marked with <WSD> tags:  (chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)