25). One of your classmates, Chem 109 student said, “I can make a perchlorate buffer using equal amount of 0.1 M HCIO4 and 0.1 M NaCIO4." Will the solution prepared properly by this student functions as a buffer? Another word, can this solution be a buffer? а. yes d. need only ClIO, to make the buffer. c. need only HCIO, to make a perchlorate buffer. e. none of the above b. no

25). One of your classmates, Chem 109 student said, “I can make a perchlorate buffer using equal amount of 0.1 M HCIO4 and 0.1 M NaCIO4." Will the solution prepared properly by this student functions as a buffer? Another word, can this solution be a buffer? а. yes d. need only ClIO, to make the buffer. c. need only HCIO, to make a perchlorate buffer. e. none of the above b. no

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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A 1.0 L buffer solution has 0.15 mol L1 HCN and 0.60 mol L-1 KCN. The K, of HCN is 4.9 x 10-10. Which action will destroy the buffer? A. Add 0.50 mol HCN to the buffer. B. Add 0.50 mol KCN to the buffer. C. Add 0.50 mol HCl to the buffer. D. Add 0.50 mol KOH to the buffer. E. More than one of the above will destroy the buffer.
Which of the following pairs will NOT produce a buffer solution? a. 10.0ml, 0.15M HNO3 and 2.5ml, 0.40M NaNO3 b. 10.0 ml, 0.25M H3PO4 and 4.0ml, 0.40M Na3(PO4)2 c. 10.0ml, 2.0M HCN and 5.0ml, 0.80M KCN d. 10.0ml, 0.10M CH3NH2 and 2.5ml, 0.60M CH3NH3(+) Cl(-)
1. Predict if the following solutions can act as a buffer: [ Select ] a. 0.1 M LICI and 0.1 M HCI [Select] b. 0.1 M NaHSO4 and 0.1 M H2SO4 с. О.1 М КСN and 0.1 M HCN [ Select ] d. 0.1 M NH3 and 0.1 M NH,CI [ Select ]
Q2
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3. How many grams of solid NaF (MW = 42.0 g/mol) would have to be added to 1.0 L of 1.90 M HF solution to achieve a buffer of a pH of 3.35? Assume there is no volume change. (Ka for HF = 7.2 x 10 -4) a. 2.1 x 102 g b. 97 g c. 1.3 x 102 g d. 0.074 g e. 67 g
Why are buffers required to solve the proton paradox но-н 2+ Zn Ag) ex Zn²+ www.His His His His His His 64 His 2 H-N SAR) His His His N-H BH*
3
Which of the following constitute a buffer? A. NH3 and KNO3 B. HCN & NaCN C. HF & NaCl D. NaOH & NaCl Group of answer choices C A & C B A, B and C
What is the pH of a buffer made by combining 45 ml of 0.15M nitrous acid and 20 ml of 0.175 M sodium nitrite a. 3.43 b. 3.64 c. 3.28 d. 3.06
Which of the following would be most effective as a buffer? A. pure water B. a mixture of molecules that are bonded to each other with hydrogen bonds C. a mixture of unbonded atoms D. a mixture of molecules with ionic bonds that will break apart into ions E. a mixture of nonpolar molecules
Among the given choices below, what is the best basis for choosing the right indicator for a given acid-base titration process? a. The identity of the base in the titration process b. The molarity of the acid or the base c. The pH at the equivalence point of the titration process d. The identity of the acid in the titration process