Chemical Equilibrium 1. Write the equilibrium expression for Kc for the following reactions: Question is worth 9 points.

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Chemical Equilibrium 1. Write the equilibrium expression for Kc for the following reactions: Question is worth 9 points. a. 12 (1) + Cl₂ ⇒ 2 IC b.2NO(N2) + O2 (s) c. 2H₂O₂ (g) 2 H₂O(g) + O₂(g) 2. Calculate Kp for the following equilibrium at 250°C if Kc = 0.042. Question is worth 5 points. + Cl₂w PCI PC Ka-K.(RT)An 3. Calculate Keq for the following reaction given the following equilibrium concentrations of [SO₂] = 0.400M; [H₂O) = 0.480M; [H₂SO4) = 0.600M. Question is worth 5 points. SO3+H₂O) H₂SO400
Acids and Bases 4. Ammonia undergoes hydrolysis according to the following reaction: NH3 (a) + H₂O NH4* (en) + OH (an) K=1.8 x 10-5 Calculate [NH₂], [NH.] and [OH-] in a solution originally 0.200 M NH3. Ice table is needed. Question is worth 10 points. 5. Fill in the missing information in the table below. Question is worth 26 points. pH = -log[H₂0+]; pH = -log[OH-]; [H3O+] = 10-PH; [OH-] = 10-POH PH 3.78 8.46 10.91 4.16 I [H₂0+] 3.89 x 10-4 M 8.45 x 10-13 M 7.49 x 10- M POH 5.19 2.14 9.94 [OH-] 4.88 x 10-6 M 2.31 x 10-11 M 2.57 x 10- M ACID or BASE? 6. The acid dissociation constant (Kg) for benzoic acid is 6.3 x 105. Find the pH of a 0.35 M solution of benzoic acid. Ice table is needed. Question is worth 10 points. CeHCOOH + H₂O H₂O + C₂H₂COO For
7. Find the conjugate acid of each of the following ion. Question is worth 4 points. a) CH3COO b) SO4²- c) H₂O d) 0²- OH™ HPO4²- f) g) H₂PO4 h) NH3 8. Find the conjugate base of each of the following. Question is worth 4 points. a) HNO3 b) H₂C₂O4 c) H₂SO3 d) HNO₂ e) HClO3 f) H₂O g) h) OH NH4+ 9. List seven strong acids and seven strong bases. Question is worth 7 points.
Acid Base Equilibria Application 10. Calculate is the pH of a buffer that consists of 0.45M HF and 0.35 M NaF? [K.(HF) = 7.2 x 10-]? Question is worth 5 points. www pH = pka + log[Ba Base Acid 11. Calculate the molar ratio of CHSCOOH to CsH5COONa in buffer with pH 4.2. PK, value of CeHCOOH is 4.75. Question is worth 10 points. [Base] pH =pKa+log Acid 12. What is the pH of a buffer solution that consist of 0.25 M ascorbic acid (H₂CsHcOs) and 0.35 M sodium ascorbate (NaCsH706)? pk, of ascorbic acid 4.10. Question is worth 5 points. pH = pka + log [Base] Acid
Bonus Questions: 1. Which of the following is a diprotic acid? Question is worth 3 points. A. H3PO4 B. H₂PO4 C. HPO4²- 2. Which of the following is the weakest acid in aqueous solution? Circle the correct answer. Question is worth 3 points. HCN H₂CO3 CH3COOH H₂PO4 Ka= 6.7 x 10-10 Ka= 4.3 x 10-7 Ka= 1.8 x 10-5 Ka= 7.52 x 10-³