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Sodium carbonate solution is alkaline due to hydrolysis of: a) Na+ b) CO3-- c) both Na+ & CO3--

Sodium carbonate solution is alkaline due to hydrolysis of:


a) Na+


b) CO3--


c) both Na+ & CO3--

Grade:

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear student,

conjugate bases (i.e. the anion) of weak acids are mildly basic.  Here's why...the conjugate base of any weak acid tends to be a somewhat strong base not in terms of causticity but in terms of affinity for a proton.  When a bicarbonate ion is placed in water, it absconds with a proton from a water molecule, leaving behind a hydroxide ion for every molecule of bicarbonate.  The reaction is as follows:

HCO3- + H2O -> H2CO3 + OH-

This is normally a reversible reaction, but H2CO3 (carbonic acid) has the tendency to lose a CO2 molecule, leaving behind some mildly basic water.

 

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

sagarsingh24.iitd@gmail.com

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