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Ammonium Chloride is an inorganic compound having the chemical formula NH4Cl. It is also known as hydrogen chloride salt or sal ammoniac. It is a sodium carbonate by-product.
- Ammonium Chloride is a white crystalline salt which is highly soluble in water.
- The compound is mildly acidic in nature.
- It possesses expectorant and diuretic properties.
- Ammonium Chloride is the by-product of the Solvay Process.
- It is a colourless compound that occurs in mineralogical form.
- The compound improves the adhesion between the solders
- It is used in veterinary medicine to keep sheep, goats, and cattle from getting urinary stones.
- Ammonia gas is produced when mixed with a calcium carbonate mixture.
- Shortness of breath and nausea are some of the side effects of ammonium chloride.
Read More: Ester Hydrolysis
Key Terms: Ammonium Chloride, Ammonia, Solvay Process, Nitrogen, Hydrogen Chloride, Carbon Dioxide, Calcium Carbonate, Sodium Hydroxide
What is Ammonium Chloride?
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Ammonium Chloride is an inorganic compound that is formed in burning coal dumps by the condensation of coal-derived gases. The acidifying salt can be found in the human body and in the urine.
- Ammonium chloride regulates pH and has a minor diuretic effect.
- This acid-forming salt also acts as an expectorant.
- The compound irritates the mucous membranes and provides cough alleviation.
- It is found around volcanic vents.
- The pH value of ammonium chloride is in the range of 4.6 to 6.0.
- The compound vaporizes at a temperature of 340 degrees.
Read More: Homogeneous Equilibrium
Structure of Ammonium Chloride
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NH4Cl is formed when ammonium sulphate and NaCl solutions react. In this, 5% solution of ammonium chloride (by weight) is combined with water. The chemical reaction is as follows:
(NH4)2SO4 + 2NaCl → 2(NH4)Cl + Na2SO4
The structure of ammonium chloride is given below:
Structure of Ammonium Chloride
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Properties of Ammonium Chloride
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The properties of ammonium chloride are tabulated below.
Category | Data |
---|---|
Ammonium Chloride | NH4Cl |
Molecular Weight/ Molar Mass | 53.491 g/mol |
Density | 1.53 g/cm³ |
Boiling Point | 520 °C |
Melting Point | 338 °C |
Physical Properties of Ammonium Chloride
The physical properties of ammonium chloride are as follows:
- Ammonium Chloride is a colourless and odourless compound.
- It is in the form of white crystals.
- The refractive index of ammonium chloride is 1.642.
- It is highly soluble in water, glycerol, acetone and ethanol.
- The compound is insoluble in organic solvents like ethyl acetate.
- Ammonium Chloride enthalpy of formation is −314.43 kJ mol-1.
Read More: Alliphatic Hydrocarbons
Chemical Properties of Ammonium Chloride
The chemical properties of ammonium chloride are as follows:
- Ammonium chloride decomposes to create ammonia gas and hydrogen chloride.
NH4Cl → NH3 + HCl
- Ammonia gas is produced when ammonium chloride combines with sodium hydroxide.
NH4Cl + NaOH → NH3 + NaCl + H2O
- Sodium chloride and ammonia gas are produced when ammonium chloride interacts with sodium carbonate.
2NH4Cl + Na2CO3 → 2 NaCl + CO2 + H2O + 2NH3
Read More: Colloids
Preparation of Ammonium Chloride
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Some of the methods used for the preparation of ammonium chloride are provided below:
- Commercially, ammonium chloride is made by reacting ammonia (NH3) with hydrogen chloride.
NH4Cl → NH3 + HCl
- The Solvay Process also produces ammonium chloride as a by-product. Carbon dioxide and ammonia are injected into a chilled, saturated sodium chloride solution in this process. Crystalline Ammonium Chloride is formed as the final-product.
2 NH4Cl + Na2CO3 → CO2 + 2NH3 + 2NaCl + H2O
Read More: Chemical Change
Uses of Ammonium Chloride
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Some of the uses of ammonium chloride are as follows:
- Ammonium Chloride is utilized as a nitrogen source in fertilizers.
- It is a component of glue that aids in the bonding of plywood.
- In aqueous solutions, it is employed in Leclanche cells.
- Ammonium Chloride is utilized in food additives and as yeast nutrition in bread baking.
- It is a type of acidifier.
- It is used to achieve low temperatures in cooling baths.
- They are used along with ammonia as buffer solutions.
- Cattle are fed ammonium chloride in the form of feed supplement.
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Health Effects of Ammonium Chloride
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Ammonium Chloride is a moderately hazardous substance that causes irritation, shortness of breath, cough, nausea, and headache when inhaled. When fumes of Ammonium Muriate Fume and Sal Ammoniac Fume are inhaled, it will cause symptoms of ammonium chloride poisoning.
- The gases have the potential to cause serious eye discomfort.
- Chronic exposure can produce an asthma-like response or impair kidney function.
- The maximum amount of ammonium chloride allowed in the environment is 10mg/m³.
- If exposed to fire, ammonium Chloride produces gases such as ammonia, hydrogen chloride, and nitrogen oxides.
Read More: Combined Gas Law
Things to Remember
- Ammonium Chloride is an inorganic compound having the chemical formula NH4Cl.
- It is also known as ammonia, hydrogen chloride salt, or sal ammoniac.
- Ammonium Chloride is a sodium carbonate by-product.
- It is a moderately hazardous substance that causes irritation and headache when inhaled.
- The compound is used to test for distal renal tubular acidosis.
- Ammonium Chloride is useful in veterinary medications.
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Sample Questions
Ques. What exactly is the Solvay Process? (3 marks)
Ans: The Solvay process, often known as the ammonia-soda process, is the most used industrial method for producing sodium carbonate (soda ash, Na2CO3). During the 1860s, Belgian chemist Ernest Solvay refined the ammonia-soda process into its contemporary form.
- The materials for this are salt brine (from inland sources or the sea) and limestone, which are both easily available and inexpensive (from quarries).
- Soda ash (mostly sodium carbonate (Na2CO3)) is produced by the Solvay process from brine (a source of sodium chloride (NaCl)) and limestone (a source of calcium carbonate (CaCO3)).
- The general procedure is as follows:
2NaCl+CaCO3→Na2CO3+CaCl2
Ques. What is a Leclanché cell, and how does it work? (2 marks)
Ans: In 1866, French scientist Georges Leclanché designed and patented the Leclanché cell, a type of battery. The battery had an ammonium chloride conducting solution (electrolyte), a carbon cathode (positive terminal), a manganese dioxide depolarizer (oxidizer), and a zinc anode (negative terminal) (reductant). This cell's chemistry was later successfully altered to create a dry cell.
Ques. In palaeontology, what is the role of ammonium chloride? (3 marks)
Ans: Ammonium chloride vapour is accumulated on fossils in palaeontology, where it forms a beautiful white covering of small crystals that is readily removed and relatively safe and inert.
- This hides any colouration in the fossil.
- It greatly increases the contrast in the photographic recording of three-dimensional specimens when lit from an angle.
- In archaeology, the same procedure is used to reduce reflections on glass and similar objects for photography.
- To quench reaction mixtures in organic synthesis, saturated NH4Cl solution is commonly utilized.
Ques. In the medical field, what role does ammonium chloride play? (3 marks)
Ans: Cough treatment often contains ammonium chloride as an expectorant. Its expectorant effect is due to irritative action on the bronchial mucosa, which creates excess respiratory tract fluid, which is thus easier to cough up.
- Ammonium salts cause nausea and vomiting because they irritate the stomach mucosa.
- It is used as a systemic acidifying agent in treating severe metabolic alkalosis.
- In the oral acid loading test to diagnose distal renal tubular acidosis.
- It is used in treating several urinary tract illnesses to maintain an acid pH in the urine.
Ques. What are some of the applications for ammonium chloride? (3 marks)
Ans: Ammonium chloride is primarily used as a nitrogen source in fertilizers, such as chloroammonium phosphate (90% of ammonium chloride output worldwide). The main crops fertilized in this approach are rice and wheat.
- In nickel, ammonium chloride is also used to prepare metals for grinding, galvanizing, or soldering.
- Ammonium chloride undergoes a breakdown reaction when heated, producing ammonia and gaseous hydrogen chloride.
- Despite the fact that this process looks to be comparable to sublimation, the change is chemical rather than physical.
Ques. Is there a link between Ammonium Chloride and the food industry? Explain. (3 marks)
Ans: As a yeast nutrient in breadmaking and as an acidifier, ammonium chloride, also known as sal ammoniac or salmiak, is used as a food additive with the E number E510. It's a cattle feed addition as well as a component of yeast and microbe nutritive medium.
- Ammonium chloride is used to flavour dark sweets known as salty liquorice (common in Scandinavia, the Benelux, and northern Germany).
- It give cookies a crisp texture, and to flavour the liquor Salmiakki Koskenkorva.
- It's known as "Noshader" in Iran, Tajikistan, India, Pakistan, and Arab countries.
- It is used to improve the crispness of delicacies like samosas and jalebis.
Ques. How can we get pure sodium chloride from a mixture of sodium chloride, ammonium chloride, and dirt? (3 marks)
Ans: To remove the soil, first, filter it. Second, the solution should be boiled to remove the NH3 and HCl. Ammonium chloride is a 1:1 mixture of NH3 and HCl that easily breaks down into these two chemicals when heated.
- They are also both gases.
- We can check for chloride in the vapour/distillate with a silver nitrate solution to see if the HCl has been driven off.
- Third, get rid of the water.
- A caveat is that soil is presumably full of things that dissolve in water, so the sodium chloride we get out of this is unlikely to be pure.
Ques. How do we figure out how many atoms are in NH4Cl? (2 marks)
Ans: Only the given/fixed mass of a compound's molecule can determine the number of atoms in that molecule. A mole of ammonium chloride contains six times the number of atoms as Avogadro's number. One nitrogen atom, four hydrogen atoms, and one chlorine atom make up one mole of ammonium chloride.
Ques. Ammonium chloride is a sublimation material in what way? Why? (3 marks)
Ans: When heated, it "sublimates" or transforms from a solid to a gas state without passing through a liquid state in between. The gas is made up of ammonia and hydrogen chloride rather than ammonium chloride molecules.
- This demonstrates how quickly the salt decomposes.
- When ammonium chloride is heated, it looks sublime but decomposes into ammonia and hydrogen chloride gas.
- Simply put, this is the breakdown of salt into complementary gas products.
Ques. In metalworking, how is ammonium chloride used? (2 marks)
Ans: In the preparation of metals for tin coating, galvanizing, or soldering, ammonium chloride is employed as a flux. It acts as a flux by interacting with the metal oxides on the surface of workpieces to generate a volatile metal chloride. It is supplied in blocks at hardware stores for cleaning the tip of a soldering iron for this purpose, and it can also be used as a flux in solder.
Ques. Aside from its primary usage, ammonium chloride is utilized in various ways, either directly or indirectly. Explain? (4 marks)
Ans: To work on oil wells with clay swelling difficulties, ammonium chloride in a 5% aqueous solution is used. Hair shampoo, plywood glue, and cleaning products are among the other applications. It is utilized as a thickening agent in ammonium-based surfactant systems like ammonium lauryl sulfate in hair shampoo.
- Ammonium chloride is used as a sticking agent
- In the textile and leather industries, ammonium chloride is used in dyeing, tanning, textile printing, and cotton clustering.
- When a solution of ammonium chloride and water is placed on unfinished wood and heated with a heat gun, it burns, leaving a branding iron mark without the use of a branding iron.
- The solution can be painted on the wood or stamped onto it with a regular rubber stamp.
Ques. What are the general properties of ammonium chloride? (3 marks)
Ans. The general properties of ammonium chloride are as follows:
Category | Data |
---|---|
Ammonium Chloride | NH4Cl |
Molecular Weight/ Molar Mass | 53.491 g/mol |
Density | 1.53 g/cm³ |
Boiling Point | 520 °C |
Melting Point | 338 °C |
Ques. Explain the chemical properties of ammonium chloride? (3 marks)
Ans. The chemical properties of ammonium chloride are as follows:
- Ammonium chloride decomposes to create ammonia gas and hydrogen chloride.
NH4Cl → NH3 + HCl
- Ammonia gas is produced when ammonium chloride combines with sodium hydroxide.
NH4Cl + NaOH → NH3 + NaCl + H2O
- Sodium chloride and ammonia gas are produced when ammonium chloride interacts with sodium carbonate.
2NH4Cl + Na2CO3 → 2 NaCl + CO2 + H2O + 2NH3
Ques. What are the harmful side effects of ammonium chloride? (3 marks)
Ans. The harmful side effects of ammonium chloride are as follows:
- Ammonium Chloride is a moderately hazardous substance that causes irritation, shortness of breath.
- It cause coughness, nausea, and headache when inhaled.
- When fumes of Ammonium Muriate Fume and Sal Ammoniac Fume are inhaled, it will cause symptoms of ammonium chloride poisoning.
- The gases have the potential to cause serious eye discomfort.
- Chronic exposure can produce an asthma-like response or impair kidney function.
- If exposed to fire, ammonium Chloride produces gases such as ammonia, hydrogen chloride, and nitrogen oxides.
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