Pick out a suitable acid/base pair to prepare a buffer with a pH of *(a) 4.5. (b) 8.1. *(c) 10.3. (d) 6.1.
1. Pick out a suitable acid/base pair to prepare a buffer with a pH of *(a) 4.5. (b) 8.1.
*(c) 10.3. (d) 6.1.
2. A solution is prepared by adding 0.020 mole of sodium formate, NaCOOH, to 1L
of 0.050 M formic acid, HCOOH. Assume that no volume change occurs. Calculate the H+
concentration. Ka = 1.6x10-4.
3. How many grams of sodium fluoride should be added to 612 mL solution of
hydrofluoric acid (Ka = 6.8x10-4) to produce a buffer solution in which pH = 3.10?
Ka for ascorbic acid, HC6H7O6, = 8.1x10-5. Calculate the H+ concentration and pH of 0.10
M ascorbic acid.
4. A certain hypothetical base MOH is 10% ionized in 0.005 M aqueous solution.
What is the Kb for this base?
5. What mass of sodium glycolate should be added to 400.0 mL of 1.00 M glycolic
acid to produce a buffer solution with a pH of 4.00?
6. Which has the greater buffer capacity: (a) a mixture containing 0.100 mol of NH3
and 0.200 mol of NH4Cl or (b) a mixture containing 0.0500 mol of NH3 and 0.100
mol of NH4Cl?
7. Consider solutions prepared by (a) dissolving 8.00 mmol of NaOAc in 200 mL of
0.100 M HOAc. (b) adding 100 mL of 0.0500 M NaOH to 100 mL of 0.175 M HOAc.
(c) adding 40.0 mL of 0.1200 M HCl to 160.0 mL of 0.0420 M NaOAc. In what
respects do these solutions resemble one another? How do they differ?
8. Pick out a suitable acid/base pair to prepare a buffer with a pH of *(a) 4.5. (b) 8.1.
*(c) 10.3. (d) 6.1.
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