A 500 mL buffer is usually prepared with 46 mM carbonic acid and 58 mM sodium...

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Chemistry

A 500 mL buffer is usually prepared with 46 mM carbonic acid and58 mM sodium bicarbonate. Unfortunately you have run out of thesereagents; on hand you have the following: solid citric acid,disodium maleate (salt of maleic acid), benzylamine andhydrochloric acid. Which reagent(s), and how much of each, wouldyou need to use to produce a 500 mL buffer with the same formalconcentration and pH as the carbonic acid buffer
Chemical concentration or MW Mass or volume needed
Citric acid 192.124g/mol
Disodium Maleate 2.6M
Benzylamine 1.4M
HCl 3M
water
I calculated the original pH of the solution to be 6.452 and theoriginal amount of moles to be 0.052.
What I'm stuck on is how to properly make a buffer without astrong conjugate for the colution

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3.7 Ratings (289 Votes)

The carbonic acid sodium bicarbonate buffer is described by theequationH2CO3 H2O H3O HCO3pH Pka log saltacidpH 634 log 58 x 10346 x 103pH 634 0100pH 644We need to use reagents that have pKa in the region of pH we areinterested See Answer

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Chemical	concentration or MW	Mass or volume needed
Citric acid	192.124g/mol
Disodium Maleate	2.6M
Benzylamine	1.4M
HCl	3M
water