Then we have to find a another method to separate those kind of compounds. 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.
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