Guest

1.) Why in acidic buffer solution,a mixture of weak base and its salt of strong acid is not used instead of weak acid and its salt of strong base? 2.) why in basic buffer solution,a mixture of weak acid and its salt of strong base is not used instead of weak base and its salt of strong acid?

1.) Why in acidic buffer solution,a mixture of weak base and its salt of strong acid is not used instead of weak acid and its salt of strong base?


2.) why in basic buffer solution,a mixture of weak acid and its salt of strong base is not used instead of weak base and its salt of strong acid?

Grade:Upto college level

1 Answers

SAGAR SINGH - IIT DELHI
879 Points
11 years ago

Dear student,

An acidic buffer solution is simply one which has a pH less than 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts - often a sodium salt.

A common example would be a mixture of ethanoic acid and sodium ethanoate in solution. In this case, if the solution contained equal molar concentrations of both the acid and the salt, it would have a pH of 4.76. It wouldn't matter what the concentrations were, as long as they were the same.

You can change the pH of the buffer solution by changing the ratio of acid to salt, or by choosing a different acid and one of its salts.

An alkaline buffer solution has a pH greater than 7. Alkaline buffer solutions are commonly made from a weak base and one of its salts.

A frequently used example is a mixture of ammonia solution and ammonium chloride solution. If these were mixed in equal molar proportions, the solution would have a pH of 9.25. Again, it doesn't matter what concentrations you choose as long as they are the same.

We are all IITians and here to help you in your IIT JEE preparation.

All the best.

 If you like this answer please approve it....

win exciting gifts by answering the questions on Discussion Forum

 

Sagar Singh

B.Tech IIT Delhi

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free