Why does increasing charge density matter more for the hydration enthalpy compared to the lattice energy? Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy, (ii) basicity of oxides, (iii) solubility of hydroxides. Answer: (i) Ionization enthalpy. 2LiOH +Δ → Li 2 O + H 2 O Formation of Salts with Acids The highly basic reaction of alkali metals hydroxides with all acids results in the formation of salts. Handbook of Solubility of the Academy of Sciences of the USSR [in Russian], Vol. Increasing order of Ionization Energy: Li > Na > K > Rb > Cs . The solubility increases down the column as the alkali metal ions become larger and the lattice enthalpies decrease. 1. Question 6. Solubility in water is related to the ionic nature and size. Any alkali metal, on coming in contact with air or oxygen, starts burning and oxides are formed in the process. Solubility or Hydration of Alkali Metal Ions. ... Order of Solubility. Metal hydroxides such as \(\ce{Fe(OH)3}\) and \(\ce{Al(OH)3}\) react with acids and bases, and they are called amphoteric hydroxide.In reality, \(\ce{Al(OH)3}\) should be formulated as \(\ce{Al(H2O)3(OH)3}\), and this neutral substance has a very low solubility. The sulphates of alkaline earth metals are all white solids. Be > Mg > Ca > Sr > Ba. NaOH + HCI → NaCI + H 2 O At the end of the chemical reaction, lithium gives lithium monoxide (LiO), sodium gives sodium peroxide (Na 2 O 2), and other alkali metals give superoxides (that is, each alkali metal atom forms bonds with two oxygen atoms). 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. Solubility: The solubility of the sulphates in water decreases down the groups i.e. Solubility in water: Alkaline earth metal hydroxides are less soluble in water as compared to the alkali metal hydroxides. 0. 5. Completely soluble metal hydroxides in water Alkali Metals. All alkali metals hydroxides … However, these hydroxides are less basic than the corresponding alkali metal hydroxides because of higher ionization energies, smaller ionic sizes and greater lattice energies. The hydroxides are less basic than the corresponding alkali metal hydroxides because of higher ionization enthalpies , smaller ionic size and greater lattice energies. I know that, solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. 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:- Lithium-ion is the most soluble and the solubility decreases with increasing size so that Cesium ion is the least water-soluble alkali metal ion. When solubility of metal hydroxide in water is high, it gives a good alkaline solution due to complete dissociation of metal hydroxide compound for releasing of hydroxyl ions (OH-) into the water. 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 . Reaction with Oxygen. Properties of Sulphates of Alkali Earth Metals. Solubility and Stability of Alkali Metal Hydroxides All these hydroxides, except for lithium hydroxide, are highly water soluble and thermally stable. Examples: KOH, NaOH. Amphoteric Hydroxides. 1, Binary Systems, Book 1, Moscow-Leningrad (1961), p. 94. Not all metal hydroxides behave the same way - that is precipitate as hydroxide solids. 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