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Potassium Nitrate is formed by fractional crystallization of Potassium Chloride and Sodium Nitrate. It is identified as a white solid crystal form substance sometimes colourless which is soluble in water. The chemical formula of Potassium Nitrate is KNO3. It is also known as saltpeter and comes out as Potassium salt from niter rocks or Nitric Acid. When Potassium Nitrate is heated it breaks down to form Nitrogen and Oxygen. The odour of it can cause severe irritation to the nose and throat causing coughing and difficulty to breathe properly but it is considered a safe salt. The common uses of Potassium Nitrate can be seen in laboratories, gunpowder and also as fertilizer.
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Key Terms: Potassium Nitrate, Alkali Metal, Potassium Hydroxide, Nitrogen, Niter, Nitric Acid, Boiling Point, Saltpeter, Ionic Compound
Potassium Nitrate
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Potassium Nitrate is a chemical compound found in rocks of niter. It is generally called saltpeter which means "Salt from Petra". It is a white crystal solid substance and is non-deliquescent. When heated, it breaks up the nitrogen and oxygen. The chemical formula of Potassium Nitrate is KNO3.
Potassium Nitrate
Read More: Potassium Chlorate
Synthesis of Potassium Nitrate
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Potassium Nitrate is formed as a result of the reaction of potassium hydroxide with nitric acid. The reaction of both substances forms potassium nitrate and water. It is formed by the process of neutralization. The formula is-
KOH + HNO3 → KNO3 + H2O
Potassium Nitrate is a good oxidizing agent. While heated up it breaks down into nitrogen and oxygen. It is an alkali metal and ionic compound. It is not soluble in cold water or normal temperature water but is soluble in hot water.
Properties of Potassium Nitrate
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Some of the important properties of Potassium Nitrate are as follows:
| Particulars | Properties |
|---|---|
| Metal | Alkali Metal |
| Boiling Point | 400°C |
| Density | 2.109g |
| 334°C |
Uses of Potassium Nitrate
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There are many uses for Potassium Nitrate which makes it an important salt. The various uses are listed below:-
- Potassium Nitrate is used as gunpowder and in the making of bombs or other destructive weapons.
- It contains all the micronutrients which help the plants to grow faster and healthier. So it is used as a fertilizer in agriculture.
- In the process of Nitric Acid preparation, it is used in laboratories.
- It is a widely known desensitizing agent.
- Potassium Nitrate is used in the Cigarette making industries.
- It is ideal for the preservation of hides.
- Potassium Nitrate is used for medicinal purposes as a diuretic.
- To ease tooth pain and decrease tooth sensitivity Potassium Nitrate is commonly found in Toothpaste.
- It is widely used as a preservative for meat in food industries.
- It is used as an antidote to Cyanide poisoning.
Uses of Potassium Nitrate
Health Hazards of Potassium Nitrate
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Along with various uses of Potassium Nitrate there are many dangers and hazards which should be taken care of. Following are the health hazards which one should be cautious of while working with Potassium Nitrate:
- It is a chemical which is used as a fertilizer which may be dangerous to health because consumption of a chemical causes effects on internal organs.
- While heating it up or breathing the gas, it might cause irritation in the throat as well as the nose. Breathing it continuously might lead to severe coughing and lung infection or Bronchitis development.
- It can cause death if consumed directly.
- Exposure to the skin can cause skin infections and drying or cracking. Sometimes it can lead to dermatitis.
- Eye irritation or eye infection can be caused by exposure to the eyes.
Read More: Potassium Iodate
Things to Remember
- Potassium Nitrate is an alkali metal and is ionic with a boiling point of 400° C and a melting point of 334° C. Potassium nitrate has a density of 2.109 g. It is also a great oxidizing agent and releases oxygen when heated.
- Potassium Nitrate is a white solid crystal-like substance which is not soluble in water but can dissolve in hot water at an exact temperature reaching its boiling point.
- Children must be kept away from Potassium Nitrate because it is harmful and it might cause serious health issues including an eye infection, throat coughing of phlegm and also nose irritation.
- It is used in major industries like food, cigarette making and meat industries. It is also used in hazardous weapon-making industries such as gunpowder.
Sample Questions
Ques. Explain the synthesis of Potassium Nitrate. (3 Marks)
Ans. Potassium Nitrate is formed when potassium hydroxide reacts with nitric acid. Though potassium Nitrate is found commonly in rocks of niter and from cave walls.
KOH + HNO3 —> KNO3 + H2O
It is an Alkali metal. When broken down or heated up it gives oxygen and nitrogen. It is a great oxidizing agent. Potassium Nitrate is identical to a white crystal-like substance. It is not soluble in alcohol but can dissolve in hot water.
Ques. Which of the household products contains Potassium Nitrate? (3 Marks)
Ans. Potassium Nitrate can be easily found in many household products as well as agricultural products such as Toothpaste, fertilizer and pesticides, in fireworks and also in Cigarettes. It is harmful when in its raw state but in household products, it is not used in its pure state so it is not dangerous. But like in Cigarettes it affects slowly and might result in long term diseases.
Ques. As toothpaste contains Potassium Nitrate. Isn't it harmful to consume it? (3 Marks)
Ans. Toothpaste contains Potassium Nitrate to ease teeth from pain and also to decrease the tooth sensitivity caused due to hot and cold food consumption and weak gums. Potassium Nitrate is not harmful when mixed with other substances and it is not used as a raw chemical in toothpaste. Potassium nitrate in its original and pure state is harmful. On the other hand, it is considered a safe salt and will not affect household products like toothpaste.
Ques. List some of the dangers caused by Potassium Nitrate (KNO3). (3 Marks)
Ans. Potassium Nitrate can be harmful in the following ways:-
- It is harmful to the eyes and may cause eye infection when exposed.
- It causes irritation to the nose and throat when breathing closely and it will lead to coughing and lung infection when breathed heavily.
- It is used as gunpowder in bomb-making which makes it explosive.
- It can cause skin infections when exposed to skin continuously.
- It is used in Cigarettes which is harmful in the long term as it causes harmful diseases like cancer.
Ques. What are a few common uses of Potassium Nitrate? (3 Marks)
Ans. Along with dangers, Potassium Nitrate is considered a safe salt and has many uses:-
- It is used as a pesticide and in fertilizer because it contains micronutrients.
- It is used in Toothpaste to ease teeth pain and sensitivity.
- Used as an antidote in order to combat Cyanide poisoning.
- It is a great preservative of meat and is used in food industries.
- It is a desensitizing agent.
Ques. What is Potassium Nitrate? Explain in simple words. (3 Marks)
Ans. Potassium Nitrate is a white crystal solid substance which is formed by potassium hydroxide and nitric acid. It is also commonly found in niter rocks and cave walls. It is also known as saltpeter or niter.
Ques. Is Potassium Nitrate (KNO3) acid or base? (3 Marks)
Ans. Potassium Nitrate (KNO3) is neither an acid nor a base. It is a neutral salt because it is formed by a neutralization reaction from a strong base (KOH) along with a strong acid (HNO3). The pH value of Potassium Nitrate is seven and is a great oxidizing agent.
Ques. Is Potassium Nitrate (KNO3) Ionic or Molecular? (3 Marks)
Ans. Potassium Nitrate is an ionic salt with nitrogen and potassium ions. It is a chemical substance also known as saltpeter. It is an oxidizing agent and an alkali metal nitrate. It is formed by the reaction of potassium hydroxide with nitric acid.
Ques. Is Potassium Nitrate (KNO3) a weak or strong electrolyte? (3 Marks)
Ans. Electrolytes ionize completely. The chemical substances which ionize completely are termed strong electrolytes and substances which ionize partially are termed weak electrolytes. Potassium Nitrate (KNO3) is a strong electrolyte because it is formed with a strong acid and a strong base and also it ionizes completely.
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