

Brief Explanation of Barium Sulfate - BaSO4
It is an inorganic compound with the chemical name Barium Sulfate.
Barium Sulfate is made up of two components: a barium cation and the sulfate anion. The sulfur is attached to four oxygen atoms. BaSO4 is a sulfate salt of barium and it can be found in the form of mineral barite. It is a crystalline solid white which is insoluble in water and alcohol but soluble in concentrated acids. It is odourless.
Barium Sulfate is an alkaline, divalent metal. It is non-toxic and is safe for medical use. It is widely used in the production of oil and natural gas to get high-density drilling fluids by keeping the boreholes free of rock.
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Properties of Barium Sulphate
Physical Properties
Pure barium sulfate is found as a white, odorless powder or small crystals with a density of 4.49 g/mL, a melting point of 1580 °C and a boiling point of 1600 °C.
Chemical Properties
Barium sulfate is said to have extremely poor solubility in the universal solvent water. It is also insoluble in alcohols, and soluble in concentrated acids. It reacts violently with aluminum powder. Barium sulfate has numerous medical and radio imaging uses due to its water insolubility and radio-opaque properties.
Barium Sulphate Uses
Barium sulfate is a contrast agent. Barium sulfate starts functioning by coating the inside of your oesophagus, stomach, or intestines which allows them to be seen more clearly on a CT scan or other radiologic (x-ray) examination.
Barium sulfate is taken into use to help diagnose certain disorders of the oesophagus, stomach, or intestines.
Barium sulfate may also be used for some other factors not listed in this medication guide. Drilling fluids
About 80% of the world's barium sulfate production, mostly purified mineral, is consumed as a component of oil well drilling fluid. It increases the density of the fluid, increasing the hydrostatic pressure in the well and reducing the chance of a blowout.
Radiocontrast agent
Barium Sulfate Suspension
Barium sulfate in suspension is now and again utilized medicinally as a radiocontrast specialist for X-ray imaging and other indicative strategies. It is regularly utilized in imaging of the GI tract during what is casually known as a "barium meal". It is managed orally, or by bowel purge, as a suspension of fine particles in a thick milk-like arrangement (frequently with sweetening and seasoning agents added). Although barium is a heavy metal, and its water-solvent mixes are usually poisonous, the low dissolvability of barium sulfate shields the patient from engrossing destructive measures of the metal. Barium sulfate is likewise promptly expelled from the body, dissimilar to Thorotrast, which it replaced. Because of the high nuclear number (Z = 56) of barium, its compounds ingest X-rays more unequivocally than compounds derived from lighter nuclei.
Shade
Most manufactured barium sulfate is utilized as a part of white colour for paints. In oil paint, barium sulfate is practically transparent, and is utilized as a filler or to alter the consistency. One significant producer of artists' oil paint sells "perpetual white" that contains a blend of titanium white shade (TiO2) and barium sulfate. The blend of barium sulfate and zinc sulfide (ZnS) is the inorganic pigment called lithopone. In photography, it is utilized as a covering for certain photographic papers.
Barium Sulfate Side Effects
You should go for emergency medical assistance if you have indications of a hypersensitive response: hives; troublesome breathing; expanding of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe stomach pain;
severe cramping, diarrhoea, or constipation;
ringing in your ears;
sweating, confusion, fast heart rate; or
pale skin, blue-coloured skin, weakness.
mild stomach cramps
nausea, vomiting; or
loose stools or mild constipation.
Barium Sulfate Formula
Barium sulfate is a significant inorganic chemical with several applications, including medical uses.
Structure and Formula of barium sulfate: The chemical formula of barium sulfate is BaSO4 and its molar mass is 233.43 g/mol. It is a salt made up of the barium cation (Ba2+) and the sulfate anion (SO42-), in which sulfur is joined to four oxygen atoms. The barium metal is present in the +2-oxidation state. The chemical structure of barium sulfate is shown as below:
Occurrence: Barium sulfate occurs naturally as the mineral barite, which is widely found and can be considered as the major source of barium and other barium compounds.
Did you know?
Barium Sulphate is insoluble in water. If under certain conditions it was made to dissolve in the water the solution will be very toxic.
Barium Sulphate is commonly used to perform X-rays of the stomach and intestines.
It is also used extensively in paints and the making of glasses.
Did you know what gives your fireworks green colour? It is the presence of Barium Nitrate that gives it a flashy green colour upon burst.
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FAQs on Barium Sulfate - BaSO4
1. What is Barium Sulfate and what is its chemical formula?
Barium Sulfate is an inorganic salt with the chemical formula BaSO₄. It is composed of a barium cation (Ba²⁺) and a sulfate anion (SO₄²⁻). It is a white, crystalline solid that is known for being odourless and having a high density.
2. What is the naturally occurring mineral form of Barium Sulfate (BaSO₄)?
Barium Sulfate naturally occurs as the mineral barite. This mineral is the primary commercial source from which barium and most of its other compounds are extracted and processed for various industrial applications.
3. What are the key physical properties of Barium Sulfate?
The main physical properties of Barium Sulfate include:
- Appearance: It is a white crystalline solid or powder.
- Solubility: It is practically insoluble in water and alcohol but can dissolve in hot, concentrated sulfuric acid.
- Density: It has a high density of approximately 4.49 g/mL.
- Melting Point: It has a very high melting point of 1580 °C.
4. Why is Barium Sulfate (BaSO₄) practically insoluble in water, despite being an ionic compound?
Barium Sulfate's insolubility in water is due to its extremely high lattice enthalpy. For an ionic compound to dissolve, the energy released during hydration (hydration enthalpy) must be sufficient to overcome the energy holding the crystal lattice together. In BaSO₄, the electrostatic forces between the large Ba²⁺ and SO₄²⁻ ions are very strong, resulting in a lattice enthalpy that is much greater than its hydration enthalpy. Therefore, water molecules cannot effectively break apart the crystal structure.
5. How is pure Barium Sulfate prepared from its mineral source?
Pure Barium Sulfate is typically prepared from impure barite ore through a process called carbothermal reduction. The process involves two main steps:
- The impure barite (BaSO₄) is heated with coke (carbon), which reduces the sulfate to sulfide, forming water-soluble barium sulfide (BaS).
- The barium sulfide is then separated from impurities and reacted with sulfuric acid (H₂SO₄) or sodium sulfate. This causes pure Barium Sulfate to precipitate out of the solution, which can then be filtered, washed, and dried.
6. What are the most important uses of Barium Sulfate in medicine and industry?
Barium Sulfate has several major applications due to its unique properties:
- Radiocontrast Agent: It is widely used in medicine for X-ray imaging of the gastrointestinal (GI) tract in a procedure known as a 'barium meal'.
- Oil & Gas Drilling: It is a crucial component of drilling fluids, where it acts as a weighting agent to increase fluid density and prevent well blowouts.
- Pigment and Filler: It is used as a white pigment called lithopone (a mixture with zinc sulfide) or as a filler in paints, plastics, and rubber to increase density and opacity.
- Paper Manufacturing: It is used as a coating for photographic paper to increase its brightness and smoothness.
7. If soluble barium compounds are toxic, why is it safe to ingest BaSO₄ for a 'barium meal' X-ray?
The safety of Barium Sulfate for medical use is entirely due to its extreme insolubility in water and body fluids. While the barium ion (Ba²⁺) itself is toxic if absorbed by the body, BaSO₄ does not dissolve in the digestive system. As a result, the toxic ions are never released into the bloodstream. The compound simply passes through the GI tract and is eliminated from the body without being absorbed, making it safe for diagnostic purposes.
8. How does Barium Sulfate work as a radiocontrast agent in medical imaging?
Barium Sulfate works as a radiocontrast agent because the barium atom has a high atomic number (Z = 56). This makes it very effective at absorbing X-rays, a property known as being radio-opaque. When a patient ingests a suspension of BaSO₄, it coats the inner lining of the esophagus, stomach, and intestines. Since X-rays cannot easily pass through the barium coating, these otherwise invisible soft tissues become clearly outlined on an X-ray image, allowing doctors to diagnose disorders.

















