shows a very feeble. just! ‘orcentble: ieee 
alae ei quantitatively. ns order to prepare the ‘bisulphiie'e comr nee 
formula C,H,O, NaHISO/. “haLO, indicated by Beitagsione: Geile tests 
interfere. It is extracted with the benzaldehyde and can be separated from 
which © cor 
of about 0.02 he cent. of chlorine. The reaction ecg ae 
a saturated ‘sodium inca solution To: the peace Bria 
benzaldehyde and benzoic acid as follows: he adds sodium es to the mi 
hydrazin*®) and 10 cc. of a 10 per cent. ethereal solution pf acetic ‘acid and then vaporate 
the einer in a current of air. The residue is. Roan: oF benzal det pet one 
crucible, dried for two hours in a-vacuum at 70° and ented 
_ The liquid obtained through extraction with ether is acidulated with 
the remaining benzoic aid being dissolved i in 50 pei cent. alcohol rad i 
phenol-_ or thymolsulphonphthalein®) as indicator, —. (2 ea 
Mixtures of benzoic acid and benzaldehyde-sodium bisulphite w were z 
way, when very exact results were obtained. ae ; a 
pil alcohol. 
1) Journ. thdnebe! Mande “Engin, Chonistey 1 (1909), 256; fi Revenh ‘Gelber 1909, 188, 
Chem. Soc. 40 (1918), 1453. — 4) Geiger recommends to distil the phenylhyd zin in 
to keep it in a hydrogen atmosphere. — *) The presence of small quan 
washing with 10 per cent. alcohol. — 5) See also page ij 75 of this Fi 
Australia of 3m August 1918; The Chemist nd, Dee | of Hegrolatieas January 
Journ. Pharm. 91 (1919), 297. j a ptt Ay 
