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Give chemical properties of water. |
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Answer» Solution :Water reacts with a large number of substances some of the important REACTIONS are given below. (i)Amphoteric NATURE : It has the ability to act as an acid as well as a base i.e., it behaves as an amphoteric substance. In the Brönsted sense it acts as an acid with `NH_3` and a base with `H_2S` . `H_2O_((l))+NH_(3(aq)) hArr OH_((aq))^(-) + NH_(4(aq))^(+)` `H_2O_((l))+H_2S_((aq))hArr H_3O_((aq))^(+) + HS_((aq))^(-)` (iii) Hydrolysis Reaction : Due to high dielectric constant, it has a very strong hydrating tendency. It dissolves many ionic compounds. However, certain covalent and some ionic compounds are hydrolysed in water. `P_4O_(10(s)) + 6H_2O_((l)) to 4H_3PO_(4(aq))` `SiCl_(4(l)) + 2H_2O_((l)) to SiO_(2(s)) +4HCl_((aq))` `N_((s))^(3-) +3H_2O_((l)) to NH_(3(G)) + 3OH_((aq))^(-)` (iv) Hydrates Formation: From aqueous solutions many salts can be crystallised as hydrated salts. Such an association of water is of different types viz., (i)Coordinated water e.g., `[Cr(H_2O)_6]^(3+) 3Cl^(-)` (ii)interstitial water e.g., `BaCl_2. 2H_2O` (iii) hydrogen-bonded water e.g., `[CU(H_2O)_4]^(2+) SO_4^(2-) . H_2O` in `CuSO_4 . 5H_2O` |
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