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Define pKa and discuss the following trend in pKa values:
Benzoic acid pKa= 4.19; p-chlorobenzoic acid pKa= 3.98; p-nitrobenzoic acid pKa= 3.41

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John Edward Cayas
John Edward CayasLv10
28 Apr 2021

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Related questions

(1) Write the acid dissociation constant expression for acetic acid (HC2H3O2).

(2) If the pKa of an acidic solution is 2.34, what is the acidรขย€ย™s corresponding Ka for that acid?

(3) Define equivalence point and discuss the difference between equivalence point and end point.

(4) When is pH = pKa?

In the following acid-base reaction, will the equilibrium lie on the side of the reactants or the side of the products, and why?

You Answered

Reactants, because pKa of A > pka of C

Reactants, because pKa of B < pka of A

Correct Answer

Products, because pKa of C > pKa of B

Products, because pKa of C < pKa of A

Please explain how to get the right answer for good ratings!

1. If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2solution is 3.11 which of the following is true.
- [HCHO2] < [NaCHO2]
- [HCHO2] = [NaCHO2]
- [HCHO2] << [NaCHO2]
- [HCHO2] > [NaCHO2]
-it is not possible to make a buffer of this pH from HCHO2 andNaCHO2

2. You wish to Prepare an HC2H3O2 buffer with a pH of 4.24. If thepKa of this is 4.74, what is the ratio of C2H3O2-/HC2H3O2?

3. A Buffer Solution is 0.100 M in both HC7H5O2 and LiC7H5O2 andhas a pH of 4.19. Which of the following pH values would you expectfrom the addition of a small amount of a dilute solution of astrong base?
- 3.89
- 3.69
- 5.69
- 4.49
- There is not enough information.

4. Which of the following acids (listed with pKa values) and theirconjugate base would form a buffer with a pH of 8.10?
- HC7H5O2, pKa=4.19
- HF, pKa=3.46
- HClO, pKa=7.54
- HCN, pKa=9.31
- HClO2, pKa=1.96

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