Strontium Chlorate

Strontium Chlorate is hygroscopic and has found use in sealed pyrotechnic devices where it produces a red colour.
The trihydrate usually exists.
It can be made by electrolysis.
It starts to decomposed at 120C.

From Mil. Ref.

Strontium Chlorate, Sr(ClO₃)₂

molecular weight 254.54,
white rhombic crystals,
mp dec 120C, @density of 3.152
soluble in water, insoluble in alcohol
Can be obtained by neutralizing aqueous HCI03 with either Sr(OH)2 or SrCO3.
The anhydrous salt may also be obtained by heating the octahydrate or other hydrates to 120C.
The Trihydrate, Sr( ClO₃)₂ .3H₂O is reported as having been obtained in needle-like crystals by cooling a 59.7%? soln of Strontium Chlorate to - 40C, and rhombic prisms by cooling a 64.7%? solution to -20C / -25C.
Octahydrate, Sr(CIO₃)₂ .8H₂O;
mw 398.67,
white needles,
melting point (looses 8H20 at 120C^o.)
Can be prepared either by electrolysis of strong aqueous solution of SrCl₂ or by passing chlorine gas through a warm aqueous solution of SR(OH)₂ with subsequent evaporation of the water and crystalization of the octahydrate

Uses: The ocrahydrate is used as an oxidizing agent in explosives, exercising a cooling effect due to the large amount of water of crystalization, and in pyrotechnic compositions for producing a red light.

Izzo gives the following composition for violet light star:
Sr Chlorate, 14.5, K Chlorate 58.5 , Cu Carbonate 10, Sulfur 10 & shellac 77-
Note: This a dangerous composition because of the Chlorate + Sulfur.

Solubility of Strontium Chlorate
Temp.	Grams Sr(ClO3)2 per 100gms saturated solution.
0	63.23
10	63.4
15	63.55
25	63.78
35	64.17
45	64.55
55	64.95
65	65.32
75	66.07
85	66.41
95	67.08
110	67.8
121 (bp)	68.7

See here for solubility data.

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