most soluble metal carbonate is? None of the carbonates is anything more than very sparingly soluble. As a result, larger cations form STRONGER bonds with larger anions (CO3 is considered a decent size anion). Alkali metals impart characteristic colours to the flame. This gives these metals some of the greatest electronegativity differences when forming bonds. Abstract. Sulphates. Alkali metals dissolve in liquid ammonia to form blue and conducting solution. The carbonates tend to become less soluble as you go down the Group. They are generally water-soluble and heat-stable. Chemical properties of alkali metals: Alkali metals are highly reactive in nature. Alkali metals hydroxides are very strong bases, highly soluble in water and are not decomposed on heating.However, LiOH decomposes on heating to give because latter is more stable than former. The solubility of sulphates in water decreases on moving down the group B e S O 4 and M g S O 4 are fairly soluble in water while B e S O 4 is completely insoluble. Their basic strength increases from LiOH to CsOH due to a corresponding decresae in the I.E., of the metal in a group,i.e., the order:- This being said, alkali metals comprise the least electronegative group in the entire periodic table . Li 2 CO 3 → Li 2 O +CO 2 … But carbonates of alkaline earth metals are insoluble in water. Carbonates exist as solid and insoluble in water. The electron pair is so closely attracted to the electron acceptor that they are practically transferred to it. You know only alkali metal carbonate compounds (except lithium carbonate) are soluble in water from metal carbonate compounds. As we know that for alkaline earth metals as we move down the group, the lattice enthalpy of carbonates remain approximately the same. Hello! (c)Sulphate-thermal stability is good for both alkali and alkaline earth metals. The solubility of carbonates decreases from Be to Ba. Therfore, finding most solble metal compound is easier. The carbonates of alkaline earth metals and Lithium carbonate decompose on heating to form oxides with the evolution of CO2. The sulphates of alkaline earth metals are all white solids. Mg 2+ is a much smaller in size than Ba 2+ because it contains less protons and neutrons in its nucleus. Be > Mg > Ca > Sr > Ba. Alkali metals carbonates (M 2 CO 3) are This is due to increases in lattice energy of sulphate down the group which predominates over hydration energy. Alkali metals exhibit +1 oxidation states in their compounds. Ionic character and the thermal stability of the carbonates increases from Be to Ba. Solubility: The solubility of the sulphates in water decreases down the groups i.e. Question 20. Alkali metals hydroxides are highly basic in nature. Properties of Sulphates of Alkali Earth Metals. In the presence of carbon dioxide, carbonates dissolve by forming bicarbonates. Carbonates: - The carbonates of alkali metals except lithium carbonate are stable towards heat. Because the alkali metals are highly electropositive, their hydroxides are very strong bases, forming salts with all oxocids (H 2 SO 4, H 2 CO 3, HNO 3, H 3 PO 4 and HNO 2). Alkali metal sulphates are more soluble in water than alkaline earth metals. lithium carbonate: 1.29 g/100 ml of water at 25 0 C; Sodium carbonate: 16.4 g/100 ml of water at 15 0 C Among the carbonate melts, the class of alkali metal carbonates (Li 2 CO 3, Na 2 CO 3i and K 2 CO 3) and their mixtures are the most prominent.These melts are fairly stable in the temperature range of 400 to 1000°C, exhibit low vapor pressures, can be easily contained in common ceramic and alloy materials, and are environmentally safe. 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