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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

Chemicalconcentration or MWMass or volume needed
Citric acid192.124g/mol
Disodium Maleate2.6M
Benzylamine1.4M
HCl3M
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

Answer & Explanation Solved by verified expert
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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