Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Question

Question

Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook (2.148, 7.199, 12.35) . Calculate the pH of a buffer that is 0.10 M in KH2PO4 and 0.050 M in Na2HPO4. What is the pH after adding 5.0 mL of 0.20 M HCl to 0.10 L of this buffer?

science chemistry

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

Add a comment

Answer 2

Similar Homework Help Questions

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish...

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.580. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? Mass NaH2PO4=? Mass Na2HPO4=?
4. What molar ratio of HPO4 2-to H2PO4-in solution would produce a pH of 7.0? Phosphoric...

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...
A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium...

A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium lactate per liter. (a) Calculate the pH of the buffer. (b) Calculate the change in pH when 5.0 mL of 0.50 M HCl is added to 1.0 L of the buffer. (c) What pH change would you expect if you added the same quantity of HCl to 1.0 L of pure water?

What concentrations of acetic acid (pKa 4.76) and acetate would be required to prepare a 0.10...

What concentrations of acetic acid (pKa 4.76) and acetate would be required to prepare a 0.10 M buffer solution at pH 4.5? Note that the concentration and/or pH value may differ from that in the first question. STRATEGY 1. Rearrange the Henderson-Hasselbalch equation to solve for the ratio of base (acetate) to acid (acetic 2. Use the mole fraction of acetate to calculate the concentration of acetate. 3. Calculate the concentration of acetic acid Step 1: Rearrange the Henderson Hasselbalch...
Calculate the pH of the following acid–base buffers. Be sure to state and justify any assumptions...

Calculate the pH of the following acid–base buffers. Be sure to state and justify any assumptions you make in solving the problems. a. 100.0 mL of 0.025 M formic acid and 0.015 M sodium formate b. 50.00 mL of 0.12 M NH3 and 3.50 mL of 1.0 M HCl c. 5.00 g of Na2CO3 and 5.00 g of NaHCO3 diluted to 0.100 L 4. (10 Points) Calculate the pH of the buffers in problem 3 after adding 5.0 mL of...
Prepare 250.00 mL of an phosphate buffer (pKa=7.199) with a total phosphate concentration of 0.020000 M...

Prepare 250.00 mL of an phosphate buffer (pKa=7.199) with a total phosphate concentration of 0.020000 M and a pH of 6.900 using the usual method for preparing a buffer using a pH meter, Dibasic Sodium Phosphate and a HCl solution. 1. Calculate the amount of Dibasic Sodium Phosphate (Na2HPO4 FW=141.959) required to prepare this solution. Report your answer in the appropriate units and to the appropriate number of significant figures to match the instrument you plan to use to measure...

Phosphate buffered saline (PBS) is a buffer solution commonly used in biological research. The buffer helps...

Phosphate buffered saline (PBS) is a buffer solution commonly used in biological research. The buffer helps to maintain a constant pH. The osmolality and ion concentrations of the solution usually match those of the human body. A) You need to prepare a stock solution at pH 7.00 with KH2PO4 and Na2HPO4 (pKa =7.21). What would be the respective concentration of these substances if you wish to obtain the final phosphate concentration [HPO4 −2 ] + [H2PO4 − ] = 0.3...
I have already figured out part a. I need help with b and c. thank you. 38. A buffer solution is 0.40 M NH3 and 0.6...

I have already figured out part a. I need help with b and c. thank you. 38. A buffer solution is 0.40 M NH3 and 0.60 M NH4CI. Kb for NH3 is 1.8 x 10-5 a) Calculate the pH for the buffer system. pH = 7.08 b) Calculate the pH of the solution after adding 0.00600 moles of NaOH to 400.0 mL of the buffer. c) Calculate the pH of the solution after adding 0.050 moles of HCl to 600.0...
1) Calculate the pH of the solution that results from each of the following mixtures. A) 150.0 mL...

1) Calculate the pH of the solution that results from each of the following mixtures. A) 150.0 mL of 0.26 M HF with 225.0 mL of 0.32 M NaF B) 165.0 mL of 0.12 M C2H5NH2 with 275.0 mL of 0.22 M C2H5NH3Cl 2) A) As a technician in a large pharmaceutical research firm, you need to produce 100. mLof a potassium dihydrogen phosphate buffer solution of pH = 6.91. The pKa of H2PO4− is 7.21. You have the following...

1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2...

1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2. If a buffer solution is 0.200 M in a weak base (?b=5.0×10−5) and 0.530 M in its conjugate acid, what is the ph 3. Phosphoric acid is a triprotic acid (?a1=6.9×10−3, ?a2=6.2×10−8 , and ?a3=4.8×10−13 To find the pH of a buffer composed of H2PO4 - (aq) ) and HPO4 2− (aq) , which...

Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Homework Answers

Add Answer to:
Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Post as a guest

Earn Coins

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish...

4. What molar ratio of HPO4 2-to H2PO4-in solution would produce a pH of 7.0? Phosphoric...

A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium...

What concentrations of acetic acid (pKa 4.76) and acetate would be required to prepare a 0.10...

Calculate the pH of the following acid–base buffers. Be sure to state and justify any assumptions...

Prepare 250.00 mL of an phosphate buffer (pKa=7.199) with a total phosphate concentration of 0.020000 M...

Phosphate buffered saline (PBS) is a buffer solution commonly used in biological research. The buffer helps...

I have already figured out part a. I need help with b and c. thank you. 38. A buffer solution is 0.40 M NH3 and 0.6...

1) Calculate the pH of the solution that results from each of the following mixtures. A) 150.0 mL...

1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2...

Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Homework Answers

Add Answer to: Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...

Post as a guest

Earn Coins

Add Answer to:
Phosphoric acids have three pKa. You can find their value from appendix 11 in the textbook...