1.Oxalic acid, H2C2O4, is a weak diprotic acid (pKa,1=1.27 and pKa,2=4.28 at
25oC). What is the pH of 0.127 mol/L H2C2O4(aq) at 25oC?
Give your answer accurate to two decimal places. 2. What is the pH of 0.00105 mol/L H2SO4(aq) at 25oC? For H2SO4, Ka1 is very
large and pKa,2=1.96 at 25oC.
Give your answer accurate to two decimal places. 3. Which of the following expressions hold for 0.10 mol/L H3A(aq). Assume that
H3A is a weak triprotic acid.
(a) [H2A-] = 2 [HA2-] = 3 [A3-]
(b) Ka2=[A3-][H+]/[HA2-]
(c) 0.10 = [H3A] + [H2A-] + [HA2-]+[A3-]
(d) [H+][OH-] = Kw
(e) [H+] = [H2A-] + [HA2-]+[A3-] + [OH-]
(f) Ka1Ka2Ka3=Kw 4. What is the pH of a 0.111 mol/L solution of sodium fluoride, NaF, at 25oC?
(pKa=3.18 at 25oC for HF.)
Give your answer accurate to two decimal places. 5.How many moles of NaOH must be added to 0.400 L of 0.191 mol/L HC3H5O3(aq)
to obtain a solution with pH=3.6? Assume the temperature is 25oC. (For HC3H5O3,
pKa=3.86 at 25oC).
Give your answer accurate to three significant figures. You may enter 1.23x103 as 1.23e-3. 6. What is the final pH of the solution when 10.0 mL of 0.117 mol/L NaOH(aq) and
30.0 mL of 0.191 mol/L HCOOH(aq) are mixed? Assume the temperature is 25oC.
(For HCOOH, pKa=3.74 at 25oC).
Give your answer accurate to two decimal places. 7.What is the pH at the equivalence point when when 45.0 mL of 0.181 mol/L
HC3H5O3(aq) is titrated with 0.117 mol/L NaOH(aq)? Assume the temperature is
25oC. (For HC3H5O3, pKa=3.86 at 25oC).
Give your answer accurate to two decimal places. 8. What is the final pH at 25oC when 72.0 mL of 0.137 mol/L NaOH(aq) and 40.0 mL
of 0.195 mol/L HA(aq) are mixed. Assume that HA is a weak monoprotic acid with
pKa=6.51 at 25oC.
Give your answer accurate to two decimal places. 9. If 50.0 mL of 0.131 mol/L NaOH(aq) and 25.0 mL of 0.185 mol/L HA(aq) are
mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid
with pKa=5.29 at 25oC.
Give your answer with three significant figures. 10. Consider the following titration curve for the titration of a weak monoprotic acid,
HA, with NaOH(aq). At which point(s) does the condition [Na+]eq = [A-]eq hold
true? In this problem, assume that "=" means "is approximately equal to". You
may make more than one selection. (a) before the titration starts (A)
(b) at all points before the equivalence point (B)
(c) at the equivalence point (C)
(d) beyond the equivalence point (D)
(e) the condition is never satisfied

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