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Showing posts with label Hydrolysis reactions (Inorg). Show all posts
Showing posts with label Hydrolysis reactions (Inorg). Show all posts

Saturday, February 8, 2020

What are the hydrolysis products of urea ?

Urea is an organic diamide and is subjected  to hydrolysis by water, the solvent in urine. Water is the nucleophile in the substition and the result it can be visualized as carbonic acid and ammonia .The carbonic acid is unstable and decomposes to carbon dioxide.

Related Questions:

(1) Is all the C-C bond length in fullerene is equal ?












Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Aluminium forms covalent compound with chloride because lonisation enthalpy (∆iH= +5137 kJ/mole) of Aluminium is very high due to small size and chlorine is unable to convert  Al into Al+3 ions. 

However, when anhydrous AlCl3 (which is covalent in character) is dissolved in water, it undergoes hydration as follow:  

 Al2CI6 + H2O --> 2[Al(H2O)6]+3 + (∆H)  

Hydration of anhydrous aIuminium chloride is highly exothermic in nature. The hydration enthalpy is more than ionisation enthalpy of aluminium.This hydration enthalpy removes all the three valence electrons of the aluminium leading to the formation of Al3+ more easly.This AI3+ is hydrated with water and form a complex ion. Thus in water Al exist as [Al(H2O)6]+3 . The three electrons of aluminum is accepted by CI of AlCl3. Thus hydrated AlCl3  represented [Al(H2O)6]Cl3   and it is ionic in nature.

Related Questions: 

(1) Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

(2) Why Ga has small size than Al exceptionally

(3) Why aqueous solution of borax reacts with two moles of acids ?

(4) What is structure of solid Ortho Boric acid ?

(5) What is the structure of trimetaboric acid and trimetaborate ion?  

(6) Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?

(7) Why Borazine (B3N3H6) is also known as inorganic benzene ?.

(8) Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.

(9) Why B-F do not exist as dimer?. Explain.

(10) Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

(11) Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?

(12) Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:

(13) What is the molecular formula of Borax ?

(14) What is the difference between the structure of AlCl3 and diborane?

Friday, February 7, 2020

Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

We know that CCI4 does not undergo hydrolysis since "C" does not have d orbital. The central atom of all other element contains empty d-orbitals and hence undergoes hydrolysis. As the oxidation state of the central atom increases from +2 (MgCI2) to +3 (AICI3) to +4 (SiCI4) to +5 (PCl5), the extent of hydrolysis increases accordingly. Thus, the overall increasing order of extent of hydrolysis follows the order: 
 ["CCI4 < MgCI2 < AICl3 < SiCl4 < PCl5"]

Related Questions:

Although Sulphur contain vacant d-orbital but SF6 does not under go hydrolysis. Why ?

In SF6 Sulphur atom contain vacant d-orbital but SF6 does not undergo hydrolysis because Sulphur is sterically protected (Crowding) by six fluorine atoms and water molecules are unable to co-ordinate with vacant d-orbital of sulphur atom. Down the group in Suphur family extent of Hydrolysis increases due to increasing of size of central atoms crowding decrease. The order is as 
   [" SF6 < SeF6 < TeF6 "]

Related Questions:

(1) What are the SESQUI OXIDES ? give the examples.

Sunday, February 2, 2020

CCl4 can not be hydrolysed but SiCl4 can be. Why?

Carbon tetrachloride (SiCl4) easily hydrolysed due to availability of vacant d – orbitals in valence shell of their central atom ( Silicon), hence it can easily extend their coordination number beyond four but this is not possible in case of carbon tetrachloride (CCl4) due to absence of vacant d – orbitals in carbon atom.

Related Questions: