Explain any four of the chemical properties of water.

Explanation

i) Hydrolysis Reaction : The chemical interaction of a compound with water is called as hydrolysis.
`to` Water has high hydrating ability because of high dielectric constant.
`to` Covalent as well as ionic compounds undergo hydrolysis.
Eg : `P_(4)O_(10(s))+6H_(2)O_((l))tounderset("orthophosphoric acid")(4H_(3)PO_(4(aq)))`
`NCl_(3)+3H_(2)OtoNH_(3)+3HOCl`
`SiCl_(4)+2H_(2)OtoSiO_(2)+4HCl`
ii) Formation of hydrogen : Water can be reduced to dihydrogen by reacting with highly electropositive metals.
`2Na_((s))+2H_(2)O_((l))to2NaOH_((aq))+H_(2(g))`
`to` Water is an important source of dihydrogen.
iii) Photosynthesis reaction : During photo synthesis reaction water gets oxidised to `O_(2)`.
`6CO_(2(g))+6H_(2)O_((l))toC_(6)H_(12)O_(6(aq))+6O_(2(g))`
iv) Hydrates formation : By the association of water molecules of different types hydrated salts formed from the crystallisation of salts.
Eg : `BaCl_(2)*2H_(2)O,CuSO_(4)*5H_(2)O`
v) Amphoteric Nature : Water has the ability to act as an acid as well as base. It is an amphoteric substance.
Eg : i) `H_(2)O_((l))+NH_(3(aq))hArrOH_((aq))^(-)+NH_(4(aq))^(+)`
In this reaction `H_(2)O` acts as Bronsted acid.
ii) `H_(2)O_((l))+H_(2)S_((aq))hArrH_(3)O_((aq))^(+)+HS_((aq))^(-)`
In this reaction `H_(2)O` acts as Bronsted base.