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Calcium Bromide formula is also referred to as the Calcium Dibromide formula or Calcium Bromatum formula, which is formed by one calcium atom and two bromine atoms. The molecular or chemical formula of Calcium Bromide is CaBr2. In its anhydrous form, anhydrous is hygroscopic colorless crystals sharp saline taste and is soluble in water and alcohol. By reacting calcium carbonate (CaCO3) and calcium oxide with hydrobromic acid (HBr) Calcium Bromide is produced. Or it is formed by reacting calcium metal with elemental bromine. Moreover, it is widely used as a dense aqueous solution for drilling fluids. Apart from that, it has a wide application in neuroses medication, food preservatives, freezing mixtures, fire retardants, and photography. Let’s have a closer look at the topic and discuss some important questions.
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What is Calcium Bromide?
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Calcium bromide which is also known as Calcium dibromide is a chemical compound known for its use in some drilling fluids and also in food preservatives. Calcium bromide formula or Calcium dibromide formula or Calcium Bromatum is explained in this article. It is formed by one calcium atom and two bromine atoms. Hence, the molecular or chemical formula of Calcium bromide can be written as CaBr2.
Calcium bromide in its anhydrous form has hygroscopic colorless crystals and a sharp saline taste. It is soluble in both alcohols as well as in water. It can be produced by reacting Calcium carbonate (CaCO3) and Calcium oxide with hydrobromic acid (HBr). It is interesting to note that Calcium bromide is not found in nature.
Formula for Calcium Bromide
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The chemical formula of Calcium bromide can be represented as (CaBr2). This compound is commonly found as a hydrated salt with two molecules of H2O i.e., water and it can be also found in the hexahydrate salt form. It is formed by one cation Ca2+ and two anions Br- . Structure of CaBr2 is actually an octahedron with the Ca atom at the centre bounded with a total of six anion Br- through ionic bonds.
CaBr2
Preparation of Calcium Bromide
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One way of preparing Calcium bromide is by reacting calcium oxide with the hydrobromic acid. Another way of preparing it with the reaction of metallic Calcium with the elemental Bromine (Br). This reaction can be represented as:
CaO + 2HBr →CaBr2 + H2O
Ca + Br2 → CaBr2
Read More: Relation between Normality and Molarity
Properties of Calcium Bromide
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Calcium Bromide is a white hygroscopic powder available in the anhydrous form. The density of Calcium Bromide is 3.35 grams per liter and has a melting point of 730 degree C. the boiling point of CaBr2 is 1935 degrees C. As explained earlier it is soluble in water, alcohol but is also soluble in acetone. It is insoluble in organic solvents.
Calcium bromide can undergo many reactions. It is very useful for the chemical industry as it is used in the formation of calcium oxide from calcium bromide and oxygen gas. For this reaction to take place high temperature is required for the production of bromine gas.
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Application of Calcium Bromide
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- Mainly used as a dense aqueous solution for drilling fluid
- It has an important application in as neuroses medication, freezing mixtures, food preservatives, and in photography.
- Calcium bromide salt is use by the food industry as a preservative and as a component of freezing mixtures.
- It is also used as fire retardant, as a dehydrating agent and as wood preservatives.
- Calcium bromide is useful for controlling the wellbore pressures during completion and workover operations in the upstream oil and gas.
- Calcium bromide is sprayed for controlling the mercury emissions on the coal prior to combustion. When the coal burns, CaBr2 breaks down and reacts with the elemental mercury (Hg) to produce an ionic species of mercury. Then, we can capture it by the downstream pollution control equipment.
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Thing to Remember
- The formula of Calcium Bromide is CaBr2
- CaBr2 is hygroscopic in nature.
- CaBr2 can undergo many reactions.
- There are mainly 2 ways of preparing CaBr2 i.e., firstly by reacting calcium oxide with the hydrobromic acid and secondly by reaction of metallic Calcium with the elemental Bromine.
- Reaction can be represented as - CaO + 2HBr →CaBr2 + H2O
Ca + Br2 → CaBr2
Sample Questions
Ques. List the problem or serious health hazards of Calcium Bromide? (1 mark)
Ans. There is various health hazards associated with Calcium bromide. It can cause irritation in the eyes, skin and even mucous. It is very toxic when ingested. It is not combustible or flammable.
Ques. Calculate the molar mass of Calcium bromide? (3 marks)
Ans. firstly write the chemical formula of Calcium Bromide i.e., CaBr2
Now, the molecular mass of Calcium is = 40.078
The molecular mass of Bromide is = 79.904
Then, its molar mass will be,
= 40.078 + 2 x 79.904
= 199.89 grams per mol.
Hence, the molar mass of Calcium bromide will be 199.89 grams per mol.
Ques. List the properties of CaBr2. (4 marks)
Ans. The properties of Calcium bromide can be listed as follows:
| Chemical formula | CaBr2 |
| Molecular weight | 199.89 grams per mol.(anhydrous) 232.98 grams per mol. (dihydrate) |
| Density | 3.353 g/cm3 |
| Melting Point (M.P) | 730 degree C |
| Boling point (B.P) | 1815 degree C (anhydrous) 810 degree C (dihydrate) |
Ques. List different applications of the Calcium Bromide. (3 marks)
Ans. Different applications of the Calcium bromide can be listed below:
- Mainly used as a dense aqueous solution for drilling fluid.
- It has an important application in neuroses medication, freezing mixtures, food preservatives, and photography.
- Calcium bromide salt is used by the food industry as a preservative and as a component of freezing mixtures.
- It is also used as a fire retardant, as a dehydrating agent, and as a wood preservative.
- Calcium bromide is useful for controlling the wellbore pressures during completion and workover operations in the upstream oil and gas.
- Calcium bromide is sprayed for controlling the mercury emissions on the coal prior to combustion.
Ques. What are the ways of preparing Calcium Bromide? (2 marks)
Ans. There are mainly 2 ways of preparing Calcium Bromide. These are -
- First of preparing Calcium bromide (CaBr2) is by reacting calcium oxide with the hydrobromic acid.
- Another way of preparing it with the reaction of metallic Calcium with the elemental Bromine (Br). This reaction can be represented as:
CaO + 2HBr →CaBr2 + H2O
Ca + Br2 → CaBr2
Ques. Write a balanced equation for the reaction between Sodium hydroxide and Calcium Bromide. (3 marks)
Ans. The balanced equation for the reaction between Sodium hydroxide and Calcium bromide can be written as:
2NaOH + CaBr2 → Ca(OH)2 + 2NaBr
The chemical equation for the given reaction will be:
Sodium hydroxide + Calcium bromide → Calcium hydroxide + Sodium bromide.
Where, Sodium hydroxide = NaOH
Calcium bromide= CaBr2
Calcium hydroxide= Ca(OH)2
Sodium Bromide= NaBr
Ques. In the formula CaBr2 what does Ca stands for and also find its valency. (2 marks)
Ans. In the formula, CaBr2 , Ca stands for Calcium.
From the given formula it is evident that Ca has a valency of +2 that is why when we criss- cross it Br acquire it. And Br have a valency of -1 and hence forming the formula CaBr2.
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