c. both a. and b. d. neither a nor b 23. Which of the following is the conjugate
ID: 697786 • Letter: C
Question
c. both a. and b. d. neither a nor b 23. Which of the following is the conjugate acid of water? C. NH4 d. OH- 24. When HCI is dissolved in water which of the following is true of the equilibrium which is established? a. It lies virtually completely to the left. b. It lies slightly to the left. c. It lies virtually completely to the right. d. It lies slightly to the right. 25. When acetic acid is dissolved in water which of the following is true of the equilibrium established as represented below? CH,COOH(ag)HOCH,COO (a)+Ho (aq) a. It lies very far to the left. b. It lies slightly to the left. c. It lies very far to the right. d. It lies slightly to the right. 26. The pKa of formic acid is 3.75. What is theof formic acid? a 1.8 x 10-18b. 5.6 x 10-11 c1.8 x 104 d. 5.6x10 27. Given the following information determine which of these acids is the strongest? Ka for boric acid is 7.3 10-10 pKa of acetic acid is 4.75 Ks for lactic acid is 8.4 × 10-4 PKa of phenol is 9.89 a. acetic acid e. lactic acid b. formic acid d. phenol 28. Which of the following is the net ionic equation for the reaction of the strong acid HCI with the strong base NaOH? a. H3O+(aq) + craq) + Nadaq) + raq) Na+(aq) + cr(aq) + 2H20(1) b. HCI(aq) + NaOH(aq) NaCl(aq) + H2O(l) c. H3O+(aq) + OH(aq) 2H20(1) d. none of theseExplanation / Answer
3. H2O ------> H3O^+
conjugate acid
b. H3O^+
24.HCl is strong acid.HCl(aq) --------> H^+ (aq) + Cl^-(aq)
C >>>>answer
25.Ch3COOHis weak acid.
b. it lies slightly to left
26.PKa = 3.75
-logka = 3.75
Ka = 10^-3.75 = 0.00018 = 1.8*10^-4
c. 1.8*10^-4
27. c. lactic acid
28.C>>>>answer
29. d>>>>answer
30.c>>>>answer
31.C>>>>answer
32.b>>>answer
33.POH = 14-PH
= 14-7.4
= 6.6
d>>>answer
34.HA + NaOH ----------> NaA + H2O
HA NaOH
M1 = M2 = 0.2M
V1 = 25ml V2 = 30ml
M1V1 = M2V2
M1 = M2V2/V1
= 0.2*30/25 = 0.24M
C>>>>answer
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