CHEM 313 Chapter : Chem_313_PS1_2014_v1.pdf
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Chem 313, problem set #1, 2014: buffers, acid-base equations and applications to amino acids and peptides, 0. 500 moles of anilinium acetate, [c6h5nh3. +][ch3coo ], are dissolved in water to give 500 ml of solution at 25 c. At 25 c, the dissociation constants of acetic acid (ch3cooh), aniline (c6h5nh2), and water are ka(ch3cooh) = 1. 80 10 5, kb(c6h5nh2) = 4. 50 10 10, and kw = Explain. (b) a species such as x is stable in a particular solution if it exists in appreciable amounts in that solution at equilibrium. Let"s define appreciable amounts of x as x being present in quantities of at least 1% of all forms of x (forms of x: x , hx, x2 , etc. ). Explain your answer: you plan to proceed with an important experiment where you need 0. 01 mm aqueous solution of n- -boc-gly-oh (pka ~ 4) and resulting [n- -boc-gly-oh]/[n- -boc- You don"t want to use n- -boc-gly-oh as its own buffer.
