Homework Answers
C is the correct option, if you carefully observe the dissociation of diprotic acids, you will see that at no point of the equilibrium you will get A- as a species, instead the 'C' point indicates the A2-
H2A = H+ + HA-
HA- = H+ + A2-
this is the general equation of the dissociation of diprotic acid.
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5. The fractional composition diagram below is representative for diprotic weak acids. Which point INCORRECTLY indicates...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H, A) with pK, values of 5.00 and 9.00. 1.00 0.90 0.80 0.70 Answer Bank Fractional composition A? HA HA 0 2 3 4 5 6 i 9 10 11 12 13 pH Calculate the fraction of the diprotic acid in each of its forms at pH 5.25. CH, A =
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H,A) with pK, values of 5.00 and 9.00 НА HA A2- Fractional composition 1.00 0.90 0.80 0.70 0.60 0.50 0.40- 0.30- 0.20 0.102 Answer Bank a 0 10 11 12 13 pH Calculate the fraction of the diprotic acid in each of its forms at pH 5.27. CHA nn Fractional composition 1.00 0.90 - 0.80 0.70 0.60 0.50 0.40 0.30- 0.20 0.10- Answer Bank...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H, A) with pk,...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H, A) with pk, values of 5.00 and 9.00. HA 1.00 . . . . . Fractional composition M- Answer Bank 0.50- 0.40 0.30- - 0.20 0.10- LL 0 2 3 4 5 6 7 8 9 10 11 12 13 PH Calculate the fraction of the diprotic acid in each of its forms at pH 5.59. CH,A = 0.204 aha = 0.795 2012-...
This is a fractional composition diagram for fumaric acid. Can someone please show what a fractional...
This is a fractional composition diagram for fumaric acid. Can
someone please show what a fractional composition diagram for a
diprotic acid would look like? Thanks
H COH Fractional composition HOCH pk, = 3.02 pk = 4.48 0 1 1 2 3 4 5 6 7 PH FIGURE 10-4 Fractional composition diagram for fumaric acid (trans-butenedioic acid). At low pH, HA is dominant. At intermediate pH, HA is dominant; at high pH, A2- dominates. Because pk, and pKy are not...
4. A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 A....
4. A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 A. At what pH does [H2A] = [HA- ]? B. At what pH doe [HA- ] = [A2- ]? C. Which is the principal species at pH = 3.50, H2A, HA- , or A2- ? Justify your answer using the Henderson-Hasselbach equation. D. Which is the principal species at pH = 7.5, H2A, HA- , or A2- ? Justify your answer (don’t use Henderson-Hasselbach equation,...
The diprotic acid H2A has pK1 = 4.63 and pK2 = 8.98. a) at what pH...
The diprotic acid H2A has pK1 = 4.63 and pK2 = 8.98. a) at what pH is [H2A] = [HA-]? b) at what pH is [HA-] = [A2-]? c) Which is the principal species at pH 2.00: d) Which is the principal species at pH 6.00: e) Which is the principal species at pH 10.00:
Grade Problem 5. (10pts) A weak diprotic base B, has pKo=3 and pkp2=6 Which is /...
Grade Problem 5. (10pts) A weak diprotic base B, has pKo=3 and pkp2=6 Which is / are the most abundant species (B, BH', or BH,2") at pH=11? Final Answer
In a titration, 25 mL of 0.10 M weak diprotic acid solution was titrated by 0.10 M sodium hydroxide, NaOH, and produ...
In a titration, 25 mL of 0.10 M weak diprotic acid solution was titrated by 0.10 M sodium hydroxide, NaOH, and produced a titration curve listed below. (20 points total) 14,0 3. 12.0 10.0 8.0 pH 6.0 4.0 2.0 10.0 5.0 20.0 30.0 15.0 25.0 Volume of 0.100 M NaOH, mL The acid used in above titration is a weak diprotic acid. Briefly explain how you know it's diprotic from looking at the titration curve and how you know a...
d. If we used H2C204 as the weak diprotic acid, which of the four species, H2C204, HC2041, C2042 or OH?, will be presen...
d. If we used H2C204 as the weak diprotic acid, which of the four species, H2C204, HC2041, C2042 or OH?, will be present in the highest concentrations in a solution at the given pH's below? If you think any of the above are equal, write the two species that are equal as an equivalence (i.e. H2C204 = HC2044). [-6 points total; -2 points each] pH = 5 Answer: pH = 8 Answer:_ pH = 12 Answer: Page 5
please correct Question 1 (1 point) Saved Certain acids are defined as weak acids which means...
please correct
Question 1 (1 point) Saved Certain acids are defined as weak acids which means that a small percentage of acid molecules ionize in water. True False Question 2 (1 point) Saved Strong acids, like Hydrochloric acid, completely ionize in water. True False Question 3 (1 point) Saved The equivalence point of titration is also known as the stoichiometric point or end point. True False Question 4 (1 point) Saved Phenolphthalein is a pH indicator which turns bright pink...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H, A) with pK, values of 5.00 and 9.00. 1.00 0.90 0.80 0.70 Answer Bank Fractional composition A? HA HA 0 2 3 4 5 6 i 9 10 11 12 13 pH Calculate the fraction of the diprotic acid in each of its forms at pH 5.25. CH, A =
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H,A) with pK, values of 5.00 and 9.00 НА HA A2- Fractional composition 1.00 0.90 0.80 0.70 0.60 0.50 0.40- 0.30- 0.20 0.102 Answer Bank a 0 10 11 12 13 pH Calculate the fraction of the diprotic acid in each of its forms at pH 5.27. CHA nn Fractional composition 1.00 0.90 - 0.80 0.70 0.60 0.50 0.40 0.30- 0.20 0.10- Answer Bank...
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H, A) with pk, values of 5.00 and 9.00. HA 1.00 . . . . . Fractional composition M- Answer Bank 0.50- 0.40 0.30- - 0.20 0.10- LL 0 2 3 4 5 6 7 8 9 10 11 12 13 PH Calculate the fraction of the diprotic acid in each of its forms at pH 5.59. CH,A = 0.204 aha = 0.795 2012-...
This is a fractional composition diagram for fumaric acid. Can
someone please show what a fractional composition diagram for a
diprotic acid would look like? Thanks
H COH Fractional composition HOCH pk, = 3.02 pk = 4.48 0 1 1 2 3 4 5 6 7 PH FIGURE 10-4 Fractional composition diagram for fumaric acid (trans-butenedioic acid). At low pH, HA is dominant. At intermediate pH, HA is dominant; at high pH, A2- dominates. Because pk, and pKy are not...
Grade Problem 5. (10pts) A weak diprotic base B, has pKo=3 and pkp2=6 Which is / are the most abundant species (B, BH', or BH,2") at pH=11? Final Answer
In a titration, 25 mL of 0.10 M weak diprotic acid solution was titrated by 0.10 M sodium hydroxide, NaOH, and produced a titration curve listed below. (20 points total) 14,0 3. 12.0 10.0 8.0 pH 6.0 4.0 2.0 10.0 5.0 20.0 30.0 15.0 25.0 Volume of 0.100 M NaOH, mL The acid used in above titration is a weak diprotic acid. Briefly explain how you know it's diprotic from looking at the titration curve and how you know a...
d. If we used H2C204 as the weak diprotic acid, which of the four species, H2C204, HC2041, C2042 or OH?, will be present in the highest concentrations in a solution at the given pH's below? If you think any of the above are equal, write the two species that are equal as an equivalence (i.e. H2C204 = HC2044). [-6 points total; -2 points each] pH = 5 Answer: pH = 8 Answer:_ pH = 12 Answer: Page 5
please correct
Question 1 (1 point) Saved Certain acids are defined as weak acids which means that a small percentage of acid molecules ionize in water. True False Question 2 (1 point) Saved Strong acids, like Hydrochloric acid, completely ionize in water. True False Question 3 (1 point) Saved The equivalence point of titration is also known as the stoichiometric point or end point. True False Question 4 (1 point) Saved Phenolphthalein is a pH indicator which turns bright pink...
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