QUESTION 5 What is the highest pH buffer that could effectively be made with a weak acid that has a pK a of 3.976? 2.976 O 5.976 O 4.976 O6.976 O 1.976 QUESTION 6 Which of the following would destroy a buffer containing 0.520 moles of weak acid HA and 0.200 moles of conjugate base A "? O 0.200 mol of NaOH O 0.520 mol of NaOH O 0.100 mol of HCI O 0.423 mol of NaOH O 0.067 mol of HCI

QUESTION 5 What is the highest pH buffer that could effectively be made with a weak acid that has a pK a of 3.976? 2.976 O 5.976 O 4.976 O6.976 O 1.976 QUESTION 6 Which of the following would destroy a buffer containing 0.520 moles of weak acid HA and 0.200 moles of conjugate base A "? O 0.200 mol of NaOH O 0.520 mol of NaOH O 0.100 mol of HCI O 0.423 mol of NaOH O 0.067 mol of HCI

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question 2 Which of the following mixtures will be a buffer when dissolved in a liter of water? 0.1 mol of Ca (OH)2 and 0.3mol HI a. 0.3 mol of NaCl and 0.3mol HCI Ob. 0.4 mol of NH3 and 0.4mol HCI 0.2 mol of HBr and 0.1mol NaOH d. 0.2 mol of H3 PO4 and 0.1mol NaOH e. A Moving to the next question prevents changes to this answer. NOV 21
Which of the following acids would you use to make a buffer with a pH of 3.00? a. Nitrous acid (Ka = 7.2*10-4) b. Monobasic sodium citrate (Ka2 = 1.7*10-5) c. Ascorbic acid (Ka = 8.0*10-5) d. Hypochlorous acid (Ka = 3.0*10-8)
Question 7 of 27 Which of the following is a means of creating a buffer of H₂CO/NaHCO₂? A Mixing 10 mL of 1 M HNO3 with 10 mL of 1 M NaHCO B Adding 5 mL of 1 M HNO3 to 10 mL of 1 M HCO3 C D Adding 10 mL of 1 M NaOH to 10 mL of 1 M NaHCO Mixing 5 mL of 1 M HNO3 with 10 mL of 1 M NaHCO
How will you prepare a 0.1 L, 0.10 M buffer with pH of 6.7 if you have the following: sodium dihydrogen phosphate: 0.2 M disodium phosphate: 0.2 M hydrochloric acid: 1 M sodium hydroxide: 1 M pKa = 7.2
What mass of sodium acetate must be added to 1.25 L of 1.12 M acetic acid to make a buffer solution whose pH=5.80? Ka of acetic acid is 1.8×10-5, MCH3CO2Na =82.04g/mol Question options: 230 g 23.0 g 1.3x103 g 130 g
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What is the pH of a buffer that is 0.452 M HF and 0.337 M LiF? The K₂ for HF is 3.5 x 10-4. Your Answer: Answer
Which of the following aqueous mixtures will result in a buffer with a pH higher than 7.0? (For HCNO, Ka = 2.2×10-4, for NH3, Kb = 1.8×10-5 ) 10 mL of 0.1 M NH3 + 10 mL of 0.1 M HCl 10 mL of 0.1 M HCNO + 5.0 mL of 0.1 M NaOH 10 mL of 0.1 M HCNO + 10 mL of 0.1 M NaOH 10 mL of 0.1 M NH3 + 5.0 mL of 0.1 M HCl 10 mL of 0.1 M NH3 + 10 mL of 0.1 M HCNO
Can you help me with number 28
8,Which buffer will have the greatest capacity upon the addition of limited amounts of bases? Group of answer choices A, 0.987M NH4Cl and 0.987M NH4OH B, 1.287M NH4Cl and 0.487M NH4OH C, they have the same capacity D, 0.287M NH4Cl and 1.487M NH4OH E, 0.487M NH4Cl and 1.287M NH4OH
A buffer made of weak acid [WA] and its conjugate base [CB] is most effective when a)pH = pKa of the weak acid b)its concentration is high c)[WA] = [CB] d)all of the choices are correct
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