10137-74-3 Usage
Description
Calcium chlorate, with the chemical formula Ca(ClO3)2, is a white crystalline solid formed from calcium and the chlorate anion. It is a strong oxidizer, similar to potassium chlorate (KClO3), and has a molecular weight of 206.98 g/mol. Calcium chlorate is slightly soluble in alcohol and has a solubility of 209 g/100 ml at 20°C in water. It has a melting point of 325°C and a density of 2.71 g/cm3. Its CAS number is 10017-74-3. A dihydrate form, Ca(ClO3)2·2H2O, exists as white monoclinic crystals, which decompose upon heating above 150°C. Calcium chlorate is known for its strong oxidizing properties and can form flammable mixtures with combustible materials, potentially leading to explosions when ignited by friction or contact with strong sulfuric acid.
Uses
1. Used in Photography:
Calcium chlorate is used as a developing agent in the photography industry due to its strong oxidizing properties, which help in the process of film development.
2. Used in Pyrotechnics:
In the pyrotechnics industry, calcium chlorate is utilized as an oxidizing agent in various pyrotechnic formulations. Its strong oxidizing nature allows it to enhance the combustion and color effects of pyrotechnic compounds.
3. Used as a Dusting Powder to Kill Poison Ivy:
Calcium chlorate is employed as a dusting powder for controlling and killing poison ivy plants. Its strong oxidizing properties help in damaging the plant tissues, leading to the plant's death.
4. Used as a Herbicide:
In the agricultural industry, calcium chlorate is used as a herbicide to control and eliminate unwanted plant growth. Its strong oxidizing properties enable it to effectively kill a wide range of plants when applied appropriately.
5. Used in the Production of Oxygen:
Calcium chlorate can also be used in the production of oxygen, as it decomposes upon heating to release oxygen gas. This property makes it useful in various industrial applications where oxygen is required.
Preparation
Calcium chlorate can be prepared by the Liebig
process which is also used to prepare the alkali chlorates.
In Liebig’s process, chlorine is passed into milk of lime, at or above a temperature of 1000°C, the
apparent reaction being:
6Ca(OH)2＋ 6Cl2→5CaCl2＋ Ca(CIO3)2＋ 6H2O.
But this may comprise two minor reactions:
2Ca (OH)2＋ 2Cl2→CaCl2＋ Ca(OCl)2＋ 2H2O;
3Ca(OCI)2→2CaCl2＋ Ca(CIO3)2
This salt can also be prepared from calcium chloride
by an electrochemical method:
CaCl2 (aq)＋ 6H2O (aq)＋ e-→Ca(ClO3)2＋ 6H2
using a platinum anode and a rotating stainless steel
cathode. Yields of the dihydrate up to 78% have been
achieved. The hydrogen produced can be “burned” to reform water.
Air & Water Reactions
Water soluble.
Reactivity Profile
An oxidizing agent. Liberates explosive chlorine dioxide gas in the presence of strong acid. Heating a moist mixture with a dibasic organic acid liberates chlorine dioxide and carbon dioxide. Mixtures with ammonium salts, powdered metals, silicon, sulfur, or sulfides are readily ignited and potentially explosive [Bretherick 1979 p. 806]. A combination with finely divided aluminum can explode by heat, percussion, or friction [Mellor 2:310 1946-47].
Hazard
Oxidizer, dangerous fire risk, forms explo-
sive mixtures with combustible materials.
Health Hazard
Inhalation of dust causes irritation of upper respiratory system. Dust irritates eyes and skin. Ingestion causes abdominal pain, nausea, vomiting, diarrhea, pallor, shortness of breath, unconsciousness.
Fire Hazard
Behavior in Fire: When involved in a fire, may cause an explosion. Irritating gases may be generated when heated.
Safety Profile
Moderately toxic by
ingestion and intraperitoneal routes. A
powerful oxidant. Incompatible with Al, As,
C, Cu, charcoal, MnO2, metal sulfides, S,
dibasic organic acids, organic matter, P.
When heated to decomposition it emits
toxic fumes of Cl-. See also CHLORATES
for fire, disaster, and explosion hazards.
Potential Exposure
Calcium chlorate is used in making
fireworks, herbicides (weed killers) and in photography.
Incompatibilities: A strong oxidizer. Reacts, possibly with
risk of fire and explosion, with acids (especially organic
acids), reducing agents; aluminum, arsenic, chemically
active metals; combustible materials; ammonium compounds; charcoal, copper, cyanides; manganese dioxide,
metal sulfides; phosphorus, sulfur
Shipping
UN1452 Calcium chlorate, Hazard Class: 5.1;
Labels: 5.1-Oxidizer. UN2429 Calcium chlorate, aqueous
solution, Hazard Class: 5.1; Labels: 5.1-Oxidizer
Incompatibilities
Calcium chlorate is used in making
fireworks, herbicides (weed killers) and in photography.
Incompatibilities: A strong oxidizer. Reacts, possibly with
risk of fire and explosion, with acids (especially organic
acids), reducing agents; aluminum, arsenic, chemically
active metals; combustible materials; ammonium compounds; charcoal, copper, cyanides; manganese dioxide,
metal sulfides; phosphorus, sulfur
Waste Disposal
For barium chlorate, the
UN recommends using a vast volume of a reducing
agent (bisulfites, ferrous salts or hypo) followed by neutralization and flushing to the sewer with abundant water. This
should be applicable here as well.
Check Digit Verification of cas no
The CAS Registry Mumber 10137-74-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,1,3 and 7 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 10137-74:
(7*1)+(6*0)+(5*1)+(4*3)+(3*7)+(2*7)+(1*4)=63
63 % 10 = 3
So 10137-74-3 is a valid CAS Registry Number.
InChI:InChI=1/Ca.ClHO3/c;2-1(3)4/h;(H,2,3,4)/q+2;/p-1
