THERMAL STABILITY OF THE GROUP 2 CARBONATES AND NITRATES This page looks at the effect of heat on the carbonates and nitrates of the Group 2 elements - beryllium, magnesium, calcium, strontium and barium. Does thermal stability increase down Group 2? Wiki User Answered . 2. 6. This causes an increase in the stability of alkali. 1. The correct option is: (a) BeCO 3 < MgCO 3 < CaCO 3 < K 2 CO 3 Explanation: In all cases, for a particular set of e.g. Read more. The cycle we are interested in looks like this: The lattice enthalpies fall at different rates because of the different sizes of the two negative ions - oxide and carbonate. What is the difference between a 1 1 2 story and 2 story home? Worksheets and data sheet to establish the trends in group 2 metal and carbonate thermal stability. The correct option is: (a) BeCO 3 < MgCO 3 < CaCO 3 < K 2 CO 3. MgCO3 decomposes at 540 C. CaCO3 decomposes at 900 C. SrCO3 decomposes at 1290 C. BaCO3 decomposes at 1360 C. This is because of the increasing size of the cation (ionised metal) as we go down the group. The nitrates also become more stable to heat as you go down the Group. 1. Best answer. 0 0 1. The rest of group 1 follow the … Carbonates of alkali metals are soluble in water with the exception of Li2CO 3. This page offers two different explanations for these properties: polarizability and energetics. The same occurs in group 1. Let's use MgCO 3 as an example. Unit 5: Chemistry 2. 3. The Facts The effect of heat on the Group 2 carbonates All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas. 4 L i N O 3 H e a t 2 L i 2 O + 4 N O 2 + O 2 This is because small sized Li+ ion cannot stabilize nitrate ion. Ionisation. You should look at your syllabus, and past exam papers -. Thermal stability increases down the group because the size of the cation (positive ion) increases, so the lattice energy of the carbonate decreases, but the lattice energy of the oxide decreases faster. That's entirely what you would expect as the carbonates become more thermally stable. You can see that the reactions become more endothermic as you go down the Group. The carbonate ion has a big ionic radius so it is easily polarized by a small, highly charged cation. The thermal stability of Group II carbonates increases as we descend the group.
(ii) The solubility and the nature of oxides of Group 2 elements . Group 2 Oxides & Hydroxides w/ Water & Dilute Acid (6:58) Group 2 Salts - Solubility & Tests (7:27) Thermal Stability of Group 1/2 Carbonates (8:19) The Facts The effect of heat on the Group 2 carbonates All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas. Stability of metal carbonates One common reaction of any metal carbonates is known as thermal decomposition. The increasing thermal stability of Group 2 metal salts is consistently seen. See Answer. The thermal stability; of these carbonates increases down the group, i.e., from Be to Ba, BeCO 3 < MgCO 3 < CaCO 3 < SrCO 3 < BaCO 3 BeCO 3 is unstable to the extent that it is stable only in atmosphere of CO 2. Both carbonates and nitrates of Group 2 elements become more thermally stable down the group. To help you revise your definitions and equations. 1 decade ago. 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