Alkali metal carbonates, their thermal stability and solubility [duplicate] Ask Question Asked 3 years, 11 months ago. Aluminium carbonate is not stable in the water and hydrolysis to aluminium hydroxide, white precipitate in the water. Answer: a) both assertion and reason are true and reason is the correct explanation of asser-tion. As salt is a sulfate, the solubility differs depending on the type of salt and whether the salt is hydrated or not. ... MLA (Modern Language Association) "Group 2, Alkaline Earth Metals." Properties of Sulphates of Alkali Earth Metals. The carbonates of alkaline earth metals can be regarded as salts of weak carbonic acid (H 2 CO 3) and metal hydroxide, M(OH) 2. This is due to the fact that the lattice energy decreases down the group due to increase in size of the alkaline earth metals cation whereas the … As we know that for alkaline earth metals as we move down the group, the lattice enthalpy of carbonates remain approximately the same. Properties . (1) They are quite soft and can be cut easily. Active 2 years ago. Data on some, such as cesium and rubidium fluoride, nitrate, carbonate, and sulfate, appear to be reported for the first time. Hello! The sulphates of alkaline earth metals are all white solids. The alkaline earth metals are the elements that correspond to group 2 of the modern periodic table. M (OH) 2 + H 2 SO 4 → MSO 4 + 2H 2 O MCO 3 + H 2 SO 4 → MSO 4 + CO 2 + H 2 O . Which is the correct sequence of solubility of carbonates of alkaline earth metals ? Solubilities of the halides, nitrates, carbonates, sulfates, and some perchlorates of all the alkali metals and alkaline earth metals in methanol at room temperature have been determined. Stability of carbonates increases down group I (alkali) and group II (alkaline earth) metals. 2) sodium or ammonium carbonate is added to the solution of alkaline earth metal salt such as CaCl 2. The stability of carbonates and bicarbonates increases down the group. The carbonates decompose on heating form metal oxide and CO 2 . The density increases down the group from Li to Cs. p block metal carbonate compounds. ... Entropy change plays a big part too here. In this section, we are going to discuss solubility and colours of p block metal carbonate compounds. Solution: both are true and reason is the correct explanation of assertion. (3) They have low density because of the large atomic sizes. Aluminium carbonate - Al 2 (CO 3) 2. The carbonate ion has a big ionic radius so it is easily polarized by a small, highly charged cation. Answer: Physical properties of alkali metals are as follows. 16. Solubility is the maximum amount a substance will dissolve in a given solvent. 1) All carbonates are ionic but beryllium carbonate is prone to hydrolysis. $\endgroup$ – Mrigank Jan 27 '17 at 12:04. I meant order of solubility of M2(CO3) in water. (2) They are light coloured and are mostly silvery white in appearance. Be > Mg > Ca > Sr > Ba. 2 CaCl 2 + Na 2 CO 3 ——> CaCO 3 + 2 NaCl. Sodium metal can be easily cut using a knife. The solubility of the alkaline earth metal hydroxides in water increases with increase in atomic number down the group. This group of elements includes beryllium, magnesium, calcium, strontium, barium, and radium.The elements of this group are quite similar in their physical and chemical properties. Solubility: The solubility of the sulphates in water decreases down the groups i.e. It is measured in either, grams or moles per 100g of water. Carbonates of alkaline earth metal salt such as CaCl 2 + Na 2 CO ——! ) in water decreases down the group They are light coloured and are mostly silvery white in appearance are elements... Correspond to group 2, alkaline earth metal hydroxides in water increases with increase in atomic number the... The type of salt and whether the salt is hydrated or not Ask Question Asked 3 years 11... 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