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CHEM 1120 Name: Acid-Base Equilibrium Problems 4. A 4.6x10 molar base solution has a pH of...
Many acid-base problems can be evaluated by considering them as chemical reactions at equilibrium. The dissociation...
Many acid-base problems can be evaluated by considering them as chemical reactions at equilibrium. The dissociation reaction of a dilute acid may be written HA ßà A–+ H+ and the reaction is so fast that it comes to equilibrium immediately. a. Show that pH = pK + log10 ([A–]/[HA]) where pK = –log10 (Keq) and pH = –log10(H+) b. Consider a solution of acetic acid, which has a pK of 4.8. Estimate the pH values for 50% dissociation (resulting in...
CHE 152 Acid-base 129 Name Write the appropriate equilibrium reaction for each problem. Use the quadratic...
CHE 152 Acid-base 129 Name Write the appropriate equilibrium reaction for each problem. Use the quadratic equation if the 5% rule does not apply. Show all work for credit. 1. Consider a 0.725 M NaAlag) solution in which HAlag) has a Ka of 2.050E-03 at 25°C. a. Identify the major species present in the NaAlag) solution Major species: b. Calculate the Kb of the conjugate base, A (aq). c. Calculate the pH of a 0.725 M NaAlaq) solution. pH =
1. The weak base hydrazine, N2H4, has a Kb = 1.7 x 10-6. What is the...
1. The weak base hydrazine, N2H4, has a Kb = 1.7 x 10-6. What is the percent ionization of a 0.15 M solution? 2. Hydrofluoric Acid has a Ka of 6.8 x 10-4. Calculate the [H+] in 0.25 M HF: 3. What is the pH of a 0.050 M solution of Acetic Acid, HC2H3O2? 4. A solution has a pOH of 10.25. Calculate the [H+].
CHEMISTRY WORKSHEET Name CHEM 1120 RECITATION Date BUFFERS 1. Your employer wants you to make a...
CHEMISTRY WORKSHEET Name CHEM 1120 RECITATION Date BUFFERS 1. Your employer wants you to make a 500.0 ml buffer that contains 1.000 M benzoic acid and has a pH of 4.30. If you choose sodium benzoate to be the base, how many grams of benzoic acid and how many grams of sodium benzoate must you dissolve in water to create your buffer? Ke of Benzoic acid = 6.4 x 10-5 Benzoic acid = C H8O2 Sodium benzoate = NaC.HsO2 What...
Problem Set 15 CHEM 1252 November 10, 2019 4. A 0.100 M solution of bromoacetic acid...
Problem Set 15 CHEM 1252 November 10, 2019 4. A 0.100 M solution of bromoacetic acid (BrCH COH) is 13.2% Ionized dissociated). (a) Calculate [H3O+] (or "[*]"), [BrCH.CO." ] (or "[A-]"), and (BrCH2COH) (or "CHA]"). (b) Calculate K, and pk, for bromoacetic acid. 5. Ethylamine (CHCH NH) is a weak base in water. (a) Write a balanced chemical equilibrium reaction for the base hydrolysis of ethylamine. Label the acid, base, conjugate acid, and conjugate base. (b) Would you expect ethylammonium...
Chem 110B Name: Acid-Base Equilibria Pre-Lab 1. You have three beakers containing acidic solutions of the...
Chem 110B Name: Acid-Base Equilibria Pre-Lab 1. You have three beakers containing acidic solutions of the same volume. Beaker AS has a label of "0.1 M hydrochloric acid". Representative views of the acid molecules (water is omitted) in each beaker are below: C =HA O =A O=H a. Circle which of the following could be in beaker B. 0.1 M HNO 0.2 M HNO2 0.3 M HNO2 0.2 M HCl b. Explain your reasoning for part a. 0.3 M HCI...
This problem deals with Acid-base titrations and pH scale for a weak acid and a weak...
This problem deals with Acid-base titrations and pH scale for a weak acid and a weak base. Calculate the pH of the solution that results from adding 7.5 [ml] of Ammonia (NH3) to a beaker that contains, 100 ml of distilled water and 15 ml of 0.1 M Acetic acid (HC2H3O2). A buret containing 50 mL of 0.1 M Ammonia (NH3) is being used as the titrant. The beaker containing 100 ml of distilled water, and 15 ml of 0.1...
Data Table 1 Solution A.05M Acetic Acid IA (aq) + 1,0 (1) PH : 2.90 1,0'...
Data Table 1 Solution A.05M Acetic Acid IA (aq) + 1,0 (1) PH : 2.90 1,0' (aq) + (aq) 15 Molarity - Initial Concentration Change quilibrium Concentration 05-x K = [H,01[A] = [x][x] [HA] [.05-x] % ionization = [H0+1*100 [HA Jinitial = [x] * 100 .05 Data Table 2 Solution B 0.025M Acetic Acid PH: 3.00 IA (aq) + 10 (1) 1:0 (aq) + (aq) 1.025 Tolarity - Initial Concentration Change Equilibrium Concentration 1.025-X K = [x][x] [0.025-x] % ionization...
Part A A 0.150 M weak acid solution has a pH of 2.97. Find Ka for...
Part A A 0.150 M weak acid solution has a pH of 2.97. Find Ka for the acid. Part B Find the percent ionization of a 0.195 M HC2H3O2 solution. (The value of Ka for HC2H3O2 is 1.8×10−5.) Part C Find the pH of a 0.0191 M solution of hypochlorous acid. (The value of Ka for hypochlorous acid is 2.9×10−8.) Part D Find the pH of a 0.014 M solution of HF. (The value of Ka for HF is 3.5×10−4.) Part...
12. The pH of a solution that is 0.25 molar in acetic acid and 0.1 molar...
12. The pH of a solution that is 0.25 molar in acetic acid and 0.1 molar in sodium acetate is 4.36. What is the pka of acetic acid? 3.96 B) 4.76 C) 5.96 D) 7.76 E) none of the above
CHE 152 Acid-base 129 Name Write the appropriate equilibrium reaction for each problem. Use the quadratic equation if the 5% rule does not apply. Show all work for credit. 1. Consider a 0.725 M NaAlag) solution in which HAlag) has a Ka of 2.050E-03 at 25°C. a. Identify the major species present in the NaAlag) solution Major species: b. Calculate the Kb of the conjugate base, A (aq). c. Calculate the pH of a 0.725 M NaAlaq) solution. pH =
CHEMISTRY WORKSHEET Name CHEM 1120 RECITATION Date BUFFERS 1. Your employer wants you to make a 500.0 ml buffer that contains 1.000 M benzoic acid and has a pH of 4.30. If you choose sodium benzoate to be the base, how many grams of benzoic acid and how many grams of sodium benzoate must you dissolve in water to create your buffer? Ke of Benzoic acid = 6.4 x 10-5 Benzoic acid = C H8O2 Sodium benzoate = NaC.HsO2 What...
Problem Set 15 CHEM 1252 November 10, 2019 4. A 0.100 M solution of bromoacetic acid (BrCH COH) is 13.2% Ionized dissociated). (a) Calculate [H3O+] (or "[*]"), [BrCH.CO." ] (or "[A-]"), and (BrCH2COH) (or "CHA]"). (b) Calculate K, and pk, for bromoacetic acid. 5. Ethylamine (CHCH NH) is a weak base in water. (a) Write a balanced chemical equilibrium reaction for the base hydrolysis of ethylamine. Label the acid, base, conjugate acid, and conjugate base. (b) Would you expect ethylammonium...
Chem 110B Name: Acid-Base Equilibria Pre-Lab 1. You have three beakers containing acidic solutions of the same volume. Beaker AS has a label of "0.1 M hydrochloric acid". Representative views of the acid molecules (water is omitted) in each beaker are below: C =HA O =A O=H a. Circle which of the following could be in beaker B. 0.1 M HNO 0.2 M HNO2 0.3 M HNO2 0.2 M HCl b. Explain your reasoning for part a. 0.3 M HCI...
Data Table 1 Solution A.05M Acetic Acid IA (aq) + 1,0 (1) PH : 2.90 1,0' (aq) + (aq) 15 Molarity - Initial Concentration Change quilibrium Concentration 05-x K = [H,01[A] = [x][x] [HA] [.05-x] % ionization = [H0+1*100 [HA Jinitial = [x] * 100 .05 Data Table 2 Solution B 0.025M Acetic Acid PH: 3.00 IA (aq) + 10 (1) 1:0 (aq) + (aq) 1.025 Tolarity - Initial Concentration Change Equilibrium Concentration 1.025-X K = [x][x] [0.025-x] % ionization...
12. The pH of a solution that is 0.25 molar in acetic acid and 0.1 molar in sodium acetate is 4.36. What is the pka of acetic acid? 3.96 B) 4.76 C) 5.96 D) 7.76 E) none of the above
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