Question

How many grams of potassium dihydrogen phosphate (MW=136.09 g/mol) and dipotassium hydrogen phosphate (MW=174.18 g/mol) would be needed to produce a 2 L buffer solution of pH 6.8 at 100 mM solute concentration? The pKa’s for phosphoric acid, a triprotic acid, are 2.15, 6.82 and 12.38.

Answer #1

how many grams of acetic acid (mw 60.05 g/mol) and NaAcetate (MW
82.03 g/mol) are needed to prepare 1.0l of a 250 mM buffer of a pH
5.0 solution (pka 4.75)?

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 730.0 mL of a
0.0574 M succinic acid solution to produce a pH of 5.865? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 610.0 mL of a
0.0460 M succinic acid solution to produce a pH of 5.956? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 710.0 mL of a
0.0485 M succinic acid solution to produce a pH of 5.844? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 800.0 mL of a
0.0568 M succinic acid solution to produce a pH of 5.968? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 540.0 mL of a
0.0329 M succinic acid solution to produce a pH of 5.966? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

How many grams of dipotassium succinate trihydrate
(K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 710.0 mL of a
0.0304 M succinic acid solution to produce a pH of 5.989? Succinic
acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2). (Note:
324.45g is not correct)

How many grams of dipotassium phthalate (242.3 g/mol) must be
added to 200 mL of 0.150 M potassium hydrogen phthalate to give a
buffer of pH 5.40? The Ka's for phthalic acid are 1.12 x 10-3 and
3.90 x 10-6.

How many grams of sodium succinate (formula weight 140 g/mol)
and disodium succinate (formula weight 162 g/mol) must be added to
1 L of water to produce a solution with pH 6.0 and a total solute
concentration of 50 mM? Pka=5.64

1.074 g of N-2-acetamido-2-aminoethane-sulfonic acid potassium
salt (ACES–K , MW = 220.29 g/mol) is dissolved in 54.37 mL of
water. 22.02 mL of HCl is added to the solution, resulting in a pH
of 6.78. Calculate the concentration of the HCl solution. The pKa
of ACES is 6.85.

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