Considering the pKa table, find the pH range for the following pH buffers. 1) HPO4 2-...
Considering the pKa table, find the pH range for the following pH buffers.
1) HPO4 2- + PO4 3-
and
2) HIO + IO-
Can someone answer and explain how they got it please?
1) pKa: 12.32/12.66
Ka: 4.8/2.2×10^ -14
2) pKa: 0.80
Ka: 1.6× 10^ -1
Homework Answers
A
buffer solution is a mixture or combination of a weak acid or weak
base and its salt .
Buffers help in maintaining the pH to a constant value on addition
of small concentrations of H+/OH- to the solution.
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Considering the pKa table, find the pH range for the following
pH buffers.
1) HPO4 2-...
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4. What molar ratio of HPO4 2-to H2PO4-in solution would produce a pH of 7.0? Phosphoric acid (H3PO4), a triprotic acid, has 3 pKa values: 2.14, 6.86, and 12.4. Hint: Only one of the pKa values is relevant here. 5. For a weak acid with a pKaof 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0. 6. Which of these compounds would be the best buffer at pH 5.0: formic acid (pKa 3.8), acetic acid...
Data Table 2: Titration Curve Values pH Value Trial 1 pH Value Trial 2 pH Value...
Data Table 2: Titration Curve Values pH Value Trial 1 pH Value Trial 2 pH Value (Average) Drops NaOH Added Half- Equivalence Point Equivalence Point ? ? ? ? ? ? 0 2.5 2.5 2.5 10 4.5 4.5 4.5 20 4.5 4.5 4.5 30 4.5 4.5 4.5 40 4.5 4.5 4.5 50 O7 5 5 60 5.5 5.5 5.5 70 6 6.5 6.25 80 12.5 13 12.75 90 13.5 13.5 13.5 100 13.5 13.5 13.5 110 14 14 14 120...
Post-Lab Assignment: pH and Buffers 1. A buffer is prepared from a weak acid with a...
Post-Lab Assignment: pH and Buffers 1. A buffer is prepared from a weak acid with a Ka - 7.1 x 104 and its conjugate base. a. What pH would provide maximum buffer capacity? b. What would be the buffer range for this acid? (Your answer should show the lowest and the highest pH that would provide a reasonably effective buffer.) 2. If you were provided with a 0.1 M solution of an unknown weak acid and a 0.1 M solution...
Please explain Buffers: Solutions That Resist pH Change. Below you will find questions. 1. Define buffer...
Please explain Buffers: Solutions That Resist pH Change. Below you will find questions. 1. Define buffer and know that a buffer typically consists of a weak acid and its conjugate base. 2. Know that the common ion effect is an example of Le Châtelier’s principle. 3. Calculate the pH of a buffer solution starting with initial concentrations of weak acid and its conjugate base. 4. Use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution from the pKa...
pH of ________is expected to be lower than ________. NaOH and NaF H2PO4-1 and HPO4-2 NaHCO3...
pH of ________is expected to be lower than ________. NaOH and NaF H2PO4-1 and HPO4-2 NaHCO3 and H2CO3 Ca(OH)2 and H3PO4 Please explain how to figure it out, not just the answer. Thanks!
Can you please show math, formulas and explain. 1. If the pH of a solution is...
Can you please show math, formulas and explain. 1. If the pH of a solution is 7.5, what is the pOH? pH = - log[H+] [H+][OH-] = 1.0 x 10-14 M2 2. Given the Ka values for two acids, determine the pKas and which is a stronger acid. Ka1 = 1.38 × 10–7 Ka2 = 1.70 × 10–4 3. The pH of a sample of blood is 7.4, while gastric juice is pH 2.4. The blood sample has: A) one...
The following reagents are available: Reagent 1: pKa = 5 Reagent 2: pKa = 6.75 Reagent...
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Part 1: Buffers Considering the acetic acid sodium acetate buffer, complete the table below NaOH added/mL....
Part 1: Buffers Considering the acetic acid sodium acetate buffer, complete the table below NaOH added/mL. measured pH 0.0 20 Did the pH change a little or a lot when NaOH was added to the butter? Was the change you observed consistent with the action of a butter? For the ammonium chloride-ammonia buffer give the measured pH for the 50.0 mL of 0.10 Mammonia. Is this solution acidic, neutral, or basic? Did the pH of the ammonia increase or decrease...
Please explain Buffer Effectiveness: Buffer Range and Buffer Capacity. Below you will find key questions. 1.Know...
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Data Table 2: Titration Curve Values pH Value Trial 1 pH Value Trial 2 pH Value (Average) Drops NaOH Added Half- Equivalence Point Equivalence Point ? ? ? ? ? ? 0 2.5 2.5 2.5 10 4.5 4.5 4.5 20 4.5 4.5 4.5 30 4.5 4.5 4.5 40 4.5 4.5 4.5 50 O7 5 5 60 5.5 5.5 5.5 70 6 6.5 6.25 80 12.5 13 12.75 90 13.5 13.5 13.5 100 13.5 13.5 13.5 110 14 14 14 120...
Post-Lab Assignment: pH and Buffers 1. A buffer is prepared from a weak acid with a Ka - 7.1 x 104 and its conjugate base. a. What pH would provide maximum buffer capacity? b. What would be the buffer range for this acid? (Your answer should show the lowest and the highest pH that would provide a reasonably effective buffer.) 2. If you were provided with a 0.1 M solution of an unknown weak acid and a 0.1 M solution...
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