DEAR SIR,

why is the basicity of H3PO4 is 1????? according to the H+ ions it shoould have been 3 !!!!!!!

SINGH SINGH, 13 years ago

Grade:

4 Answers

AKASH GOYAL AskiitiansExpert-IITD

420 Points

13 years ago

Dear Singh

Basicity of H3PO4 is 3 while that of H3PO2 is 1 because in H₃PO₂one H be released due to the presence of one O-H bond where as H3PO4 will release 3H due to the presence of 3 O-H bonds.

All the best.

AKASH GOYAL

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VIBHOR GAUR

33 Points

13 years ago

basicity is not the total no. of hydrogens present in an acid.

it is the no of hydronium ions that an acid is capable of releasing easily into a solution. H3PO4 is a weak acid and dissociates into H2PO4 (-) + H(+). further dissociation doesnt take place.

hence H3PO4 is a monobasic acid in general.

VIBHOR GAUR

33 Points

13 years ago

Basicity of H3PO4 is 3.. As all the three h+ ions r available for donation. But basicity of H3PO3 Is 2 nd basicity of H3PO2 IS 1.. Only those H+ ions r available for donation which r attached to electronegative atom.. See their structure then u can easily understand..

Kushagra Madhukar

askIITians Faculty 628 Points

3 years ago

Dear student,

Please find the answer to your question.

I there is some mistake in the question.

Note that Basicity of H3PO4 is 3 while that of H3PO2 is 1 because in H₃PO₂one H be released due to the presence of one O-H bond where as H3PO4 will release 3H due to the presence of 3 O-H bonds.

Thanks and regards,
Kushagra