Like other chalcogenides of the alkaline earth metals, BaS is a short wavelength emitter for electronic displays. It is an important precursor to other barium compounds including BaCO3 and the pigment lithopone, ZnS/BaSO4. BaS is the barium compound produced on the largest scale. As all of the other substances are soluble in water we can rewrite the equation. Barium sulfide is the inorganic compound with the formula BaS. Because it is insoluble in water we know that it is the precipitate. We would expect them to undergo a double displacement reaction with each other.īy examining the solubility rules we see that, while most sulfates are soluble, barium sulfate is not. Write the reaction and identify the precipitate.īarium chloride and potassium sulfate are both ionic compounds. The exceptions are the alkali metals and the ammonium ion.ĬaSO 4 and Ag 2SO 4 are slightly soluble.Ī solution of barium chloride is mixed with a solution of potassium sulfate and a precipitate forms. It uses iron (II) sulfate and lime sulfur (calcium polysulfide) to form a clear black precipitate of iron (II) sulfide with a clear supernatent. There are many ways to make iron (II) sulfide but one reaction procedure will suit your purpose. Solutions of ions, when mixed with concentrated HCl and heated on a nickel/chromium wire in a flame, cause the flame to change to a color characteristic of the atom. Carbonates (CO 3 -2), phosphates (PO 4 -3) and sulfides (S -2) are insoluble. I can think of iron (II) sulfide ( FeS F e S). However, Equation 11.3.1 does not really represent the microscopic particles (that is, the ions) present in the solution. The exceptions are those containing Ag +, Hg +2, and Pb +2.Ħ. The equation Ba2 + (aq) + Na 2SO 4(aq) BaSO 4(s) + 2NaCl(aq) can be written to describe what happens, and such an equation is useful in making chemical calculations. Most chlorides (Cl -), bromides (Br -) or iodides (I -) are soluble. The exceptions are the alkali metal hydroxides and Ba(OH) 2.ĥ. Nitrates (NO 3 -), chlorates (ClO 3 -), and perchlorates (ClO 4 -) are soluble. Ammonium (NH 4 +) compounds are soluble.ģ. Due to both compounds are yellow color, you have to do furthermore experiments to identify compounds. how to tell if a yellow precipitate is SnS 2 or has CdS as well. ![]() for the precipitation of calcium carbonate, numerous pigment colors. Therefore, barium carbonate, barium sulfate and barium sulfite are white precipitates. Alkali metal (Group IA) compounds are soluble.Ģ. In the manufacture of lithopone, barium sulfide solution is reacted with zinc. Solubility Rules and Identifying a Precipitateġ.
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