158 SUBSTITUTED AMMONIUM COMPOUNDS.
product from half its weight of hot water. Yield, 10 to 14 g. of
hydroxylamine chloride.
Heat a trace of the hydroxylamine salt with Fehling's solution;
cuprous oxide is precipitated.
Potassium Salt of Hydroxylaminedisulphonic Acid. On add-
ing a saturated potassium acetate solution to some of the solution
of the sodium salt of hydroxylaminedisulphonic acid obtained in
the course of the foregoing procedure, crystals of the potassium
salt HO • N : (SO 3 K) 2 are deposited. With potassium chloride
the crystals separate more slowly.
Acetoneoxime, (CH 3 ) 2 C:NOH. Add a solution of 8 g. sodium
hydroxide in 12 c.c. water slowly and with constant stirring, but
without cooling, to a mixture of 14 g. hydroxylamine hydrochloride,
12 g. acetone and 13 c.c. water. Acetoneoxime separates out as
an upper layer which solidifies after standing for some time.
After several hours pour off the aqueous solution and dissolve the
oxime in ether, in which it is extremely soluble. Pass this solu-
tion through a dry filter to remove any suspended drops of aqueous
solution, and evaporate the ether on the water bath, taking the
usual precautions. On cooling, the oxime solidifies in beautiful
crystals; if desired, it may be recrystallized from a low boiling
ligroin. Yield, 10 to 13 g. Melting-point 59°-60°.- Hydrazine Sulphate, [N 2 H 4 .H 2 ] SO 4 ; Monochloramine, NH 2 Cl.
Hydrocyanic acid, as formed by the hydrolysis of potassium cyanide,
unites in aqueous solution with two molecules of potassium bisulphite, form-
ing aminomethanedisulphonate of potassium:
HCN + 2 HSO 3 K = H(NH 2 )C(SO 3 K) 2.By strongly acidifying the solution with hydrochloric acid, the difficultly-
soluble acid salt is precipitated:
H(NH 2 )C(SO 3 H)SO 3 K.By "diazotizing" the amido group, diazomethanedisulphonate of potassium is
obtained:
N\
H(NH 2 )C(SO 3 H)SO 3 K + KN0 2 = || y C(SO 3 K) 2 + 2 H 2 O.
N/
This salt is capable of adding on one molecule of potassium sulphite at the
point of the nitrogen double bond, and the acid corresponding to the salt