barium

(noun)

A metallic chemical element (symbol Ba) with an atomic number of 56.

Related Terms

Examples of barium in the following topics:

  • X-Ray Studies of the GI Tract

    • The second drink is a contrast agent, typically a thick, chalky liquid containing barium salt.
    • (This test is sometimes called a barium swallow. ) The barium outlines the stomach on the X-rays, helping the doctor find tumors or other abnormal areas.
    • Patients may feel nauseated immediately after drinking the barium.
    • Patients may eat normally after the procedure, but it is important to drink a lot of water to assist in flushing the barium through the body more easily.
    • This x-ray after barium swallow shows the effects of eosinophilic esophagitis.

  • Solubility Product Principle and Qualitative Analysis

    • A solution is 0.010M in barium chloride (BaCl2) and 0.020M in strontium chloride (SrCl2).
    • With 0.010 $\frac{moles}{liter} $of Ba2+, precipitation of barium sulfate will not occur until the sulfate ion concentration increases to:
    • This signifies that as the sulfate ion (SO42-) is added to solution and its concentration increases, barium will precipitate first.

  • The Alkaline Earth Metals

    • The alkaline earth metals (beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties:
    • Calcium-48 and barium-130 have very long half-lives and thus occur naturally.
    • Strontium and barium have some uses in medicine.
    • For example "barium meals" are used in radiographic imaging, while strontium compounds are employed in some toothpastes.

  • Ion Separation by Fractional Precipitation

    • For example, consider a solution the has 0.01 M barium chloride (BaCl2) and 0.02 M strontium chloride (SrCl2).
    • To find the solution, consider that the barium sulfate (BaSO4) solubility is given by:
    • With 0.01 M of Ba2+, barium sulfate will not precipitate until the sulfate ion concentration increases to:
    • If the sulfate ion is slowly added to the container containing both the Ba2+ and Sr2+ ions, the barium sulfate will precipitate first.

  • Predicting Precipitation Reactions

    • Sulfates (SO42-): All are soluble except lead (II) (Pb2+), barium (Ba2+), and calcium (Ca2+).
    • Compounds with fluorine: All are soluble except magnesium (Mg2+), calcium (Ca2+), strontium (Sr2+), barium (Ba2+), and lead(II) (Pb2+).

  • Lead Storage Battery

    • The paste contains carbon black, barium sulfate, and lignosulfonate.
    • The barium sulfate acts as a seed crystal for the lead-to-lead sulfate reaction.

  • Chemical Analysis

    • Barium, calcium, and strontium will precipitate at this point, but not before.

  • Manganese

    • Potassium permanganate, sodium permanganate, and barium permanganate are all potent oxidizers.

  • Strong Bases

  • Isomers in Coordination Compounds

    • For example, pentaaminebromidocobalt(III) sulphate [Co(NH3)5Br]SO4 is violet and in solution gives a precipitate with barium chloride, confirming the presence of sulphate ion.