You are making 100 mL of a 0.66M phosphoric acid buffer with a pH of 7.0. What is the concentration (M) of the base component needed to make the buffer?

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You are making 100 mL of a 0.66M phosphoric acid buffer with a pH of 7.0. What is the concentration (M) of the base component needed to make the buffer? 

Expert Solution
Step 1

For the acidic buffer solution we use Henderson Hassalbalch equation given as;

Chemistry homework question answer, step 1, image 1

Where; pH of buffer solution made ,given = 7.0

pKa is = - log(Ka) of phosphoric acid

The phosphoric acid( H3PO4) is triacidic acid ,i.e it donate 3 protons . The pKa value for each proton is different ,given as. 2.12 , 7.21 ,12.3 respectively for three donation of three protons .

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