![]() ![]() ![]() Below, we are listing precipitates of 3d metals with their colours according to the anion. Therefore we can use their precipitates colours to identify 3d metal ions. Most of 3d block metals precipitates show colours. Beryllium hydroxide ( Be(OH) 2 ) is an amphoteric hydroxide compound. When they are added to water, they are converted to their hydroxides. Sr(OH) 2 and Ba(OH) 2 are readily soluble and they are strong alkalis. Be(OH) 2, Mg(OH) 2 are insoluble in water.SrSO 4, BaSO 4 are white colour precipitates.All carbonates (CO 3 2-) of alkali earth metal ions are precipitatesĬaCO 3, MgCO 3, SrCO 3 are precipitates and they are white.This lab experiment allowed me to identify certain ions with the spot test which consisted in mixing some metal ions solutions with certain agents and observer their reactions.Alkaline earth metals forms both precipitates and solutions. ![]() The chemical properties of some elements enable us to identify them when they react with other elements. Finally, I proceed to place DMG and do the same steps that I did before adding DMG to each spot plate. After that, I added one drop of Ni2+, Na+ and the Ag+ to K4[Fe(CN)4. Then I added a drop of Pb2+ to K4(Fe and wait to observe if it have any physical change. The following step was to add K4 to the spot that contained Fe3+. Finally, in the text spot that had Ag+ I added 2 drops of potassium chromate. The next proceed was to add 2 drops of K2CrO4 in the plate that had Na+. Then, I added in the spot plate that contained Ni2+ the potassium chromate. Then I added potassium chromate to the Pb2+. I place 2 drops of K2CrO4 and added it to the Fe3+ spot plate. The next proceed was to add S2- from (NH4)2S to the new spots that contained the same ions as the procedure before. I proceed to do the same but now instead of hydrochloric acid I placed ammonia solution to the test tube that contained my ions and then wait to observe if they have any reactions. Next, I did the same with the Ni2+, the Na+, and the Ag+ to see the reactions. Then, to the plate that contained Pb2+ I added 2 drops of HCl. I proceed to add 3 drops of Fe3+ in the spot plate and then add HCl. The first proceed that I did was to add to each loop in the spot plate 3 to 4 drops of my metal ions in each spot and then added 2 to 3 drops of the agents HCl in each spot. Physical properties are the other categories and this is based in those substances that can be observed without inducing chemical change. Also, how the properties of a substance can be separated in two different categories: Chemical properties that refer to the way in which it reacts with other substances. You will use these results to develop a scheme for separating these cations when they are present in a mixture. You will initially compare the reactions of each of these with various reagents to see which form precipitates. In this experiment, you will look at part of the chemistry of five cations: Ag +, Ni2+, Na+, Pb2+, Fe3+ and an unknown. This experiment demonstrate the procedures used in developing a scheme for separating a group of cations. Identification of an unknown Cation Development of an Analysis Scheme ![]()
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