Select one: a. 436 b. 298 c. 2.29 d. 2293 e. 0.436 B. Of the following solutions

Question

Select one:

a. 436

b. 298

c. 2.29

d. 2293

e. 0.436

B.

Of the following solutions, which has the greatest buffering capacity?

Select one:

a. 0.821 M HC2H3O2 and 0.713 M NaC2H3O2

b. 0.365M HC2H3O2 and 0.497 M NaC2H3O2

c. 0.521 M HC2H3O2 and 0.217 M NaC2H3O2

d. 0.121 M HC2H3O2 and 0.116 M NaC2H3O2

C.

A solution containing which one of the following pairs of substances will be a buffer solution?

Select one:

a. KI, HI

b. None of these

c. CuCl, HCl

d. CsI, HI

e. AgBr, HBr

For a given reaction, ppg__pearson__tm__chem13b__u916.gifS do not vary with temperature. Select one: a. 436 b. 298 c. 2.29 d. 2293 e. 0.436 B. Of the following solutions, which has the greatest buffering capacity? Select one: a. 0.821 M HC2H3O2 and 0.713 M NaC2H3O2 b. 0.365M HC2H3O2 and 0.497 M NaC2H3O2 c. 0.521 M HC2H3O2 and 0.217 M NaC2H3O2 d. 0.121 M HC2H3O2 and 0.116 M NaC2H3O2 C. A solution containing which one of the following pairs of substances will be a buffer solution? Select one: a. KI, HI b. None of these c. CuCl, HCl d. CsI, HI e. AgBr, HBr ppg__pearson__tm__chem13b__u916.gifH and ppg__pearson__tm__chem13b__f94g1q19g2.gi Assume that ppg__pearson__tm__chem13b__f94g1q19g1.gi at ppg__pearson__tm__chem13b__u916.gifS = -55.5 J/K-mol. The reaction will have ppg__pearson__tm__chem13b__u916.gifH = -24.2 kJ/mol and

Explanation / Answer

A.

Delta H = T.Delta S

T = Delta H / Delta S

T = (-24.2 x 1000 ) / (-55.5) = 436 K

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B.

A solution has the greatest buffering capacity when the concentration of the weak acid is = at the concentration of its conjugate base.
So, the correct option is D.

---------

C.

Buffer solutions are made from weak acids.

HCl, HBr, HI all are strong acids.

Hence option B is correct.(None of these)

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