What Is Calcium Nitrate Definition Formula Structure Reactions and Applications
Calcium nitrate can be described as an inorganic compound having the chemical formula Ca(NO3)2.
Another name for this compound is Norgessalpeter. In 1905, it was synthesized by the process of Birkeland–Eyde at Notodden, Norway. Also, it is a nitrate salt of Calcium that contains calcium, nitrogen, and oxygen. Calcium nitrate compound is either a whitish-grey or white-colored granular solid that absorbs the air's moisture and is found usually as a tetrahydrate compound - Ca(NO3)2.4H2O.
Structure of Ca(NO3)2 Molecules
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Preparation of Calcium Nitrate
Calcium nitrate can be prepared using various methods. The most common method used in preparing this compound involves the limestone treatment with nitric acid and the subsequent neutralization of the product, that is formed with ammonia. Also, this compound is produced as an intermediate during the process of nitro phosphate (which is commonly known as the Odda process).
Calcium nitrate compound is a complex fertilizer, where it can be prepared using any of the methods given below:
Usually, when calcium carbonate, called limestone, is treated with nitric acid, calcium nitrate is formed. The reaction can be given as follows.
Ca(NO3)2 + 2HNO3 → Ca(NO3)2 + CO2 + H2O
Calcium nitrate can also be formed when an ammonium nitrate solution is mixed with a solution of calcium hydroxide. The same reaction can be given as follows.
2NH4NO3 + Ca(OH)2 → Ca(NO3)2 + 2NH4OH
Calcium Nitrate (Ca(NO3)2) Properties
Chemical Data of Calcium Nitrate
Physical Properties of Ca(NO3)2
Chemical Properties of Ca(NO3)2
On adding the calcium nitrate compound to sodium carbonate, the calcium carbonate precipitate is formed by leaving the sodium nitrate in the solution. The chemical equation can be given as follows.
Ca(NO3)2 + Na2CO3 → 2 NaNO3 + CaCO3
And, on heating, it undergoes decomposition and releases oxygen and nitrogen dioxide. The chemical equation can be given as follows.
Ca(NO3)2 → CaO + 2 NO2 + ½O2
Calcium Nitrate Uses
Let us look at a few of the calcium nitrate uses:
Calcium Nitrate is used as a fertilizer in agriculture and as an oxidizing agent in match manufacture.
It is used in the light industry to prepare incandescent lamp chimneys and fireworks.
Industrially, it is used in pyrotechnics and explosives industries.
Used for storage quality improvement of crops by reducing bitter pit in apples.
We can also use it as a raw material for making the other nitrate compounds.
Calcium nitrate is used in wastewater pre-conditioning for odor pollution control. In the wastewater system, the wastewater pre-conditioning is mainly focused on the development of anoxic biology. The sulphates’ metabolism ceases in the presence of nitrate, thereby preventing hydrogen sulfide production. Also, the simple degradable organic matter is ingested, which otherwise can cause downstream anaerobic conditions and odor pollution as well. The definition is also valid for surplus sludge treatment.
Especially in dipping processes, calcium nitrate is known to be a very common coagulant in latex production. Often, a part of the dipping bath solution contains the dissolved calcium nitrate. Also, the warm former is often dipped in the coagulation liquid, and a thin layer of the dipping liquid remains on the former. Calcium nitrate will break up the latex solution’s stabilisation when the former is dipped into latex, and also, the latex will coagulate on the former.
This compound is also used in the mixtures of molten salt. Because the dissolution of this compound in water is highly endothermic in nature, calcium nitrate is also used as a pack component. The tetrahydrate of this compound is used in the regeneratable cold packs.
FAQs on Calcium Nitrate Properties Preparation and Uses
1. What is calcium nitrate?
Calcium nitrate is an inorganic salt with the chemical formula Ca(NO3)2, composed of calcium ions and nitrate ions. It is a highly water-soluble, white crystalline compound commonly used as a fertilizer and in wastewater treatment. In aqueous solution, it dissociates completely: Ca(NO3)2(aq) → Ca2+(aq) + 2NO3-(aq). It is an important source of both calcium and nitrogen in chemistry and agriculture.
2. What is the formula and molar mass of calcium nitrate?
The chemical formula of calcium nitrate is Ca(NO3)2 and its molar mass is approximately 164.10 g·mol-1. The molar mass is calculated as follows:
- Ca = 40.08 g·mol-1
- 2 × N = 2 × 14.01 = 28.02 g·mol-1
- 6 × O = 6 × 16.00 = 96.00 g·mol-1
3. How is calcium nitrate prepared?
Calcium nitrate is commonly prepared by reacting calcium carbonate with nitric acid. The balanced chemical equation is: CaCO3(s) + 2HNO3(aq) → Ca(NO3)2(aq) + CO2(g) + H2O(l). This is an acid–carbonate reaction that produces carbon dioxide gas and water along with the soluble salt calcium nitrate.
4. Is calcium nitrate acidic or basic?
Calcium nitrate is a neutral salt in aqueous solution because it is formed from a strong acid and a strong base. It is produced from nitric acid (HNO3) and calcium hydroxide (Ca(OH)2). Since both the acid and base are strong, the resulting solution is approximately neutral (pH ≈ 7) and does not significantly hydrolyze in water.
5. What are the uses of calcium nitrate?
Calcium nitrate is mainly used as a fertilizer and in industrial applications. Its major uses include:
- Fertilizer: Supplies nitrogen and calcium to plants.
- Wastewater treatment: Controls odor by reducing hydrogen sulfide formation.
- Concrete admixture: Accelerates setting and improves strength.
- Laboratory reagent: Source of Ca2+ and NO3- ions.
6. Is calcium nitrate soluble in water?
Calcium nitrate is highly soluble in water due to the presence of nitrate ions. Nitrates are generally soluble according to solubility rules, and Ca(NO3)2 dissolves readily to form calcium and nitrate ions: Ca(NO3)2(s) → Ca2+(aq) + 2NO3-(aq). Its solubility increases with temperature, making it useful in aqueous applications.
7. What type of compound is calcium nitrate?
Calcium nitrate is an ionic compound composed of Ca2+ cations and NO3- anions. It forms through ionic bonding between the metal calcium and the polyatomic nitrate ion. As an ionic salt, it has high melting point, high water solubility, and conducts electricity when dissolved in water.
8. How do you calculate the percentage of nitrogen in calcium nitrate?
The percentage of nitrogen in calcium nitrate is approximately 17.07% by mass. Calculation steps:
- Molar mass of Ca(NO3)2 = 164.10 g·mol-1
- Mass of nitrogen = 2 × 14.01 = 28.02 g
- Percentage N = (28.02 / 164.10) × 100
9. What happens when calcium nitrate is heated?
When heated strongly, calcium nitrate decomposes to form calcium oxide, nitrogen dioxide, and oxygen gas. The balanced thermal decomposition reaction is: 2Ca(NO3)2(s) → 2CaO(s) + 4NO2(g) + O2(g). This is a typical decomposition reaction of metal nitrates, producing brown nitrogen dioxide fumes.
10. What is the difference between calcium nitrate and ammonium nitrate?
The main difference between calcium nitrate and ammonium nitrate is their cations and chemical properties.
- Calcium nitrate: Ca(NO3)2, contains Ca2+, provides calcium and nitrogen, neutral salt.
- Ammonium nitrate: NH4NO3, contains NH4+, mainly nitrogen source, slightly acidic in solution.
