Therefore, we cannot identify or separate SrSO 4 and BaSO 4 by considering only colour. As an example, both SrSO 4 and BaSO 4 are white precipitates. Can colours of precipitates be used everytime to identify compounds?Ĭannot. Sulfates of Ba 2+ and Sr 2+ are precipitates. Which anions form precipitates with s block group 2 elements?Īll carboates of s block group 2 elements are precipitates. Also sodium biocarbonate has low solubility in water. What are the precipitations of s block group 1 elementsįrom s block elements, some lithium compounds form precipitates. Then we have to find a another method to separate those kind of compounds. Can you separate compounds by checking only precipitates?Īssume that, there are two compounds which are not soluble in water and have same colour. Magnesium, calcium, zinc, lead, aluminium ions will give white precipitates with OH - ions. 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.
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