Question

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).

Answer #1

Let W g of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added

Number of moles of dipotassium succinate trihydrate

Number of moles of succinic acid (610.0 mL of a 0.0460 M)

0.0281 moles of succinic acid will react with 0.0281 moles of dipotassium succinate trihydrate to form 0.0281 moles of mono potassium succinate.

of dipotassium succinate trihydrate will remain.

Hence, 21.56 g of dipotassium succinate trihydrate must be added.

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 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 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.

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

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 solid NaOH (Mol. Wt. = 40 g mol-1) must be
added to a 0.15 L solution of 0.02 mol L–1 glycine hydrochloride to
adjust the pH to 2.65? (pKa1 = 2.35, pKa2 =
9.78)
(A) 79.92 g
(B) 7.992 g
(C) 0.799 g
(D) 0.079 g
(E) 0.008 g

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
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