What is the pH of a solution that is .24 M K2HPO4 and .088 M K3PO4?

Question

Question

Answer 1

Answer #1

mixture of K3PO4 and K2HPO4 act as acidic buffer

pH = pKa + log [K3PO4]/[K2HPO4]

pKa of K2HPO4 = 12.7

pH = 12.7 + log [0.088] / [0.240]

pH = 12.26

Add a comment

Answer 2

Similar Homework Help Questions

What is the pH of a 0.20 M solution of (a) H3PO4, (b) KH2PO4, (c) K2HPO4, and (d) K3PO4? The answ...

What is the pH of a 0.20 M solution of (a) H3PO4, (b) KH2PO4, (c) K2HPO4, and (d) K3PO4? The answers are (a) 1.46, (b) 4.67, (c) 9.76, and (d) 12.74. I have no idea how to do these problems, please show me step by step how to get to these answers.
A buffer solution is 0.451 M in KH2PO4 and 0.335 M in K2HPO4. If Ka for...

A buffer solution is 0.451 M in KH2PO4 and 0.335 M in K2HPO4. If Ka for H2PO4- is 6.2 x 10^-8 , what is the pH of this buffer solution? A buffer solution is 0.451 M in KH P04 and 0.335 M in K2HPO4. If Ką for H2PO4 is 6.2 x 10-8, what is the pH of this buffer solution? pH =
Q: What is the pH of a solution containing 0.125 M KH2PO4 and 0.175 K2HPO4 Ka...

Q: What is the pH of a solution containing 0.125 M KH2PO4 and 0.175 K2HPO4 Ka (H2PO4-) = 6.2 x 10-8 Ka (HPO42-) = 4.8 x 10-13 Q: A 0.15 M solution of a weak acid is 3.0 % dissociated. What is the Ka of this acid? Q: A solution of aspirin was prepared that is 0.16 M. The pH of this solution was measured to be 2.43. What is the Ka of aspirin? Q: A solution of formic acid...

A solution is made by mixing 50 mL of 2.0 M K2HPO4 and 25 mL of 2.0 M KH2PO4. The solution is diluted to a final volume of 200 mL. What is the pH of the final solution?

A solution is made by mixing 50 mL of 2.0 M K2HPO4 and 25 mL of 2.0 M KH2PO4. The solution is diluted to a final volume of 200 mL. What is the pH of the final solution?
Determine the volume (in L) of a 0.0764 M solution of K3PO4 that contains 38.7 g of K3PO4.

Determine the volume (in L) of a 0.0764 M solution of K3PO4 that contains 38.7 g of K3PO4.
One (10 Points). Calculate the pH and [H3O+] of a solution that was created by adding 0.350 grams of K2HPO4 and 0.5...

One (10 Points). Calculate the pH and [H3O+] of a solution that was created by adding 0.350 grams of K2HPO4 and 0.550 grams of KH2PO4 in 0.500 liters of solution.

Find the pH of each solution: 1. 30mL of 0.1M K2HPO4 mixed with 10mL of 0.1M...

Find the pH of each solution: 1. 30mL of 0.1M K2HPO4 mixed with 10mL of 0.1M KH2PO4 and 60mL of water; 2. 10mL of 0.1M K2HPO4 mixed with 30mL of 0.1M KH2PO4 and 60mL of water; Phosphoric acid, H3PO4 1st Ka&pKa 7.1 x 10-3 2.15 2nd Ka&pKa 6.3 x 10-8 7.20 3rd Ka&pKa 4.5 x 10-13 12.35
What is the pH of a phosphate buffer that is 0.05M K2HPO4 and 0.01M KH2PO4? (Show...

What is the pH of a phosphate buffer that is 0.05M K2HPO4 and 0.01M KH2PO4? (Show work)
6. What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give...

6. What is the pH of a buffered system made by dissolving 17.42 g of KH2PO4 and 20.41 g of K2HPO4 in water to give a volume of 200.0 mL? The Ka2 for dihydrogen phosphate is 6.2 x 10-8 and the equilibrium reaction of interest is H2PO4 (4) + H20 <-> H30* ( HPO4 (4) 7. Determine the pH of a 0.188 M NH3 solution at 25°C. The Kh of NH3 is 1.76 x 10-5. 8. Calculate the pH of...

Henderson-Hasselbach equation: pH- pKa log (IA-|/IHA]) 1. Phosphate buffer is a mixture of KH2PO4 and K2HPO4....

Henderson-Hasselbach equation: pH- pKa log (IA-|/IHA]) 1. Phosphate buffer is a mixture of KH2PO4 and K2HPO4. Note that KH2PO4 has one additional proton. The pKa of the acid is 6.8. Use the Henderson-Hasselbach equation (above) to calculate the ratio of [K2HPO41[KH2PO4] needed to make a solution that is pH 7.2 2. To make a solution that is 0.2 M phosphate, the concentration of KH2PO4 and K2HPO4 must add up to 0.2 M. Use the ratio you calculated above, and the...