Concept explainers
a. Calculate the pH of a buffer that is
b. What is the pH of a buffer that is
c. What is the difference between the buffers described in parts a and b?
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Chemistry for Today: General, Organic, and Biochemistry
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- A buffer prepared by dissolving oxalic acid dihydrate (H2C2O4·2H2O) and disodium oxalate (Na2C2O4) in 1.00 L of water has a pH of 5.140. How many grams of oxalic acid dihydrate (MW = 126.07 g/mol) and disodium oxalate (MW = 133.99 g/mol) were required to prepare this buffer if the total oxalate concentration is 0.110 M? Oxalic acid has pKa values of 1.250 (pKa1) and 4.266 (pKa2). What is the mass for oxalic acid dihydrate and disodium oxalate.arrow_forward2.3 20.00 mL of 0.0750 M benzoic acid ( C6H5COOH) is titrated with 0.0250 M NaOH. Ka benzoic acid = 6.5 x 10-5 A.What is the pH of the solution after the addition of 45.00 mL of NaOH? B. What is the pH at the equivalence point? C.What is the pH of the solution after the addition of 70.00 mL of NaOH?arrow_forwardThree buffers are prepared with equal concentrations of formic acid and sodium formate (Buffer 1), hydrofluoric acid and sodium fluoride (Buffer 2), and acetic acid and sodium acetate (Buffer 3). Rank the three buffers from highest to lowest pH at which they can buffer a solution (i.e., their buffering pH).(a) 1, 2, 3(b) 3, 2, 1(c) 2, 1, 3(d) 3, 1, 2arrow_forward
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