Homework Answers
8)
KNO3 is the salt of strong acid and strong base .so pH = 7.00
9)
pKa = - log (1.34 x 10^-5 ) = 4.87
pH = pKa + log [salt / acid]
= 4.87 + log [0.400 / 0.100]
pH = 5.48
10)
pKa of HNO2 = 3.16
pH = 7 + 1/2 (pKa + log C)
= 7 + 1/2 (3.16 + log 0.70)
pH = 8.50
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O OM NO which would be the 6. You are going to perform a titration between...
18. Consider a buffer solution containing HNO, and KNO, where the concentration of HNO2 is double...
18. Consider a buffer solution containing HNO, and KNO, where the concentration of HNO2 is double the concentration of KNO,. Which statement about the buffer solution is true? a) The nitrite ion concentration will increase if a strong base is added Xb) The pH of this solution is equal to the pKa value of the HNO2. c) The pK, value of HNO, will decrease if a strong acid is added. R. is a cons d) The buffer capacity of this...
need help with 6,7,8 thank you. 6. During the titration of a weak acid, at the...
need help with 6,7,8 thank you.
6. During the titration of a weak acid, at the equilvalence point the pH will be: A. greater then 7.0 B. less than 7.0 C. = 7.0 7. What is the pH of a buffer made with 0.1 Macetic acid (pk. - 4.75) and 0.250 M sodium acetate? A. 3.22 B 7.25 C. 5.00 D. 8.46 E.5.15 8. What is the pH of 100 ml of a buffer made with 0.10 M each of...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between PH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
i need help answering these questiona the graph helps to answer #1 Experiment 4 Advance Study...
i need help answering these questiona the graph helps to
answer #1
Experiment 4 Advance Study Assignment: pH, Its Measurement and Applications 1. A solution of a weak acid was tested with the indicators used in this experiment. The colors observed were as follows: Methyl violet Thymol blue Methyl yellow violet orange red Congo red Bromcresol green yellow Chapter 4: pH Measurements-Buffers and Their Properties What is the approximate pH of the solution? 2. An aqueous solution of NH, has...
CHM 130LL Experiment 12 Name: Class number: PRELAB ASSIGNMENT 1. Define the following terms. a) acid...
CHM 130LL Experiment 12 Name: Class number: PRELAB ASSIGNMENT 1. Define the following terms. a) acid b) base: c) pH: d) neutralization: 2. Which of the following is the most acidic solution? i) solution with pH = 7.0 ii) solution with pH - 11.6 ii) solution with pH 5.5 iv) solution with pH = 2.0 3. Which of the following pH indicators will not be used during the experiment? i) methyl red ii) thymol blue ii) phenolphthalein iv) red cabbage...
Section B ANALYTICAL CHEMISTRY 3. Answer ALL parts. (a) Answer each of the following i) ii)...
Section B ANALYTICAL CHEMISTRY 3. Answer ALL parts. (a) Answer each of the following i) ii) Define buffer capacity. (b) A solution was prepared by dissolving 1.572 grams of NaB (Relative Molecular Mass 169), the sodium salt of a weak base, in 100 0 cm of water. pK, for the weak acid HB is 6.3. Calculate the pi of the solution, K.-1 x 1014 (c) 20.0 cm' of the basic solution is titrated with 0.134 mol dm HCL. Calculate: i)...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between pH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
I need help with questions 1,3,4,5 1.0.15 M ammonium chloride is added to a 0.05 M...
I need help with questions 1,3,4,5
1.0.15 M ammonium chloride is added to a 0.05 M solution of ammonia. How does the pH change? NHs(aq) + H2O(1) NH(aq) + OH(aq) A. pH goes up B. pH goes down C. pH does not change 2. Which of the following would make buffer system? A. a weak asid and NaCl B. a weak acident's conjugate base C. a strong acid and a weak acid D. alveak acid and a strong acid E....
please answer all question show work number 7 only please The pH of 2.0M HCI is...
please answer all question show work number 7 only
please
The pH of 2.0M HCI is a) 2.0, b) 1.0, c) 0.0, d)<0.0. 1. 2. Thymol blue appears red below pH 1.0, yellow between pH 2.5-8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. The buffer HF/F can' be prepared by mixing a) HF and NaF, b)...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is ca...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is called its conjugate base. What base of the hydronium ion, HO? B)HO C)HO D)H E HO'has no conjugate base. Answer: acid-base pair? 38) For the reaction shown below, which of the following is a conjugate acid A)CHsN, H:0 B) CsH,N, CsH,NH' C)...
18. Consider a buffer solution containing HNO, and KNO, where the concentration of HNO2 is double the concentration of KNO,. Which statement about the buffer solution is true? a) The nitrite ion concentration will increase if a strong base is added Xb) The pH of this solution is equal to the pKa value of the HNO2. c) The pK, value of HNO, will decrease if a strong acid is added. R. is a cons d) The buffer capacity of this...
need help with 6,7,8 thank you.
6. During the titration of a weak acid, at the equilvalence point the pH will be: A. greater then 7.0 B. less than 7.0 C. = 7.0 7. What is the pH of a buffer made with 0.1 Macetic acid (pk. - 4.75) and 0.250 M sodium acetate? A. 3.22 B 7.25 C. 5.00 D. 8.46 E.5.15 8. What is the pH of 100 ml of a buffer made with 0.10 M each of...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between PH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
i need help answering these questiona the graph helps to
answer #1
Experiment 4 Advance Study Assignment: pH, Its Measurement and Applications 1. A solution of a weak acid was tested with the indicators used in this experiment. The colors observed were as follows: Methyl violet Thymol blue Methyl yellow violet orange red Congo red Bromcresol green yellow Chapter 4: pH Measurements-Buffers and Their Properties What is the approximate pH of the solution? 2. An aqueous solution of NH, has...
CHM 130LL Experiment 12 Name: Class number: PRELAB ASSIGNMENT 1. Define the following terms. a) acid b) base: c) pH: d) neutralization: 2. Which of the following is the most acidic solution? i) solution with pH = 7.0 ii) solution with pH - 11.6 ii) solution with pH 5.5 iv) solution with pH = 2.0 3. Which of the following pH indicators will not be used during the experiment? i) methyl red ii) thymol blue ii) phenolphthalein iv) red cabbage...
Section B ANALYTICAL CHEMISTRY 3. Answer ALL parts. (a) Answer each of the following i) ii) Define buffer capacity. (b) A solution was prepared by dissolving 1.572 grams of NaB (Relative Molecular Mass 169), the sodium salt of a weak base, in 100 0 cm of water. pK, for the weak acid HB is 6.3. Calculate the pi of the solution, K.-1 x 1014 (c) 20.0 cm' of the basic solution is titrated with 0.134 mol dm HCL. Calculate: i)...
Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between pH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a)...
I need help with questions 1,3,4,5
1.0.15 M ammonium chloride is added to a 0.05 M solution of ammonia. How does the pH change? NHs(aq) + H2O(1) NH(aq) + OH(aq) A. pH goes up B. pH goes down C. pH does not change 2. Which of the following would make buffer system? A. a weak asid and NaCl B. a weak acident's conjugate base C. a strong acid and a weak acid D. alveak acid and a strong acid E....
please answer all question show work number 7 only
please
The pH of 2.0M HCI is a) 2.0, b) 1.0, c) 0.0, d)<0.0. 1. 2. Thymol blue appears red below pH 1.0, yellow between pH 2.5-8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. The buffer HF/F can' be prepared by mixing a) HF and NaF, b)...
36) Which one of the following is not a strong acid? (or a weak electrolyte?) a) HNO )HCI HI )HF e) HCIO Answer: 37) The is the conjugate species that remains after an acid donates a proton is called its conjugate base. What base of the hydronium ion, HO? B)HO C)HO D)H E HO'has no conjugate base. Answer: acid-base pair? 38) For the reaction shown below, which of the following is a conjugate acid A)CHsN, H:0 B) CsH,N, CsH,NH' C)...
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