Magnesium, calcium, zinc, lead, aluminium ions will give white precipitates with OH - ions.Ĭan you separate compounds by checking only precipitates?Īssume that, there are two compounds which are not soluble in water and have same colour. Most metal hydroxides are insoluble except alkali metals and Sr, Ba. What chemicals from with OH to give a white precipitate? One precipitates (Sn(OH) 4(s)) will dissolve in excess NaOH. Add excess NaOH to white precipitates.Two white precipitates are given in two flask. Then add aqueous NaOH to two solutions.Hydrogen sulfide gas will be released from both solutionsĪnd two colorless solutions will be given. Add HCl acid separately to both precipitates.In SnS 2, Sn 4+ ion exists and CdS contains Cd 2+ ion. 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 Therefore, barium carbonate, barium sulfate and barium sulfite are white precipitates. Which anion will form a precipitate with Ba2+?īa 2+ ion form precipitates with anions such as sulfate, sulfite and carbonate. Questions asked by students Ask your question and find the answer free. That means, there are no precipitates of nitrate compounds. So when anion vary, color of preciptate also vary.ĭoes nitrate ion form precipitates with cations?Īll nitrate compounds are soluble in water. PbI 2 is yellow colour precipitate and PbCl 2 is white precipitate.
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