You wish to prepare an HC 2H 3O 2 buffer with a pH of 5.26. If...
You wish to prepare an HC 2H 3O 2 buffer with a pH of 5.26. If the pK a of is 4.74, what ratio of
C 2H 3O 2⁻/HC 2H 3O 2 must you use?
|
0.32 |
||
|
2.8 |
||
|
0.50 |
||
|
0.10 |
||
|
3.3 |
Homework Answers
You wish to prepare an HC 2 H 3 O 2 buffer with a of 4.18...
You wish to prepare an HC 2 H 3 O 2 buffer with a of 4.18 . If
the of is 4.65, what ratio of C 2 H 3 O 2 /HC 2 H 3 O 2 , must you
use ?
43) You wish to prepare an HC,H,O, buffer with a pH of 4.18. If the pK, of is 4.65, what ratio of CHO, THC,H,O, must you use? 44) A sample contains Ba,(PO.), Cds, AgCI, NH,CI, and ZnS. Which...
Question 6 -- / 1 You wish to prepare a buffer containing CH3COOH with a pH...
Question 6 -- / 1 You wish to prepare a buffer containing CH3COOH with a pH of 5.44. If the pka of acetic acid is 4.74, what ratio of [CH3C00-1/[CH3COOH] must you use? 0 5.0 2 1.4 3 0.70 4 1.1 © 0.20 4 of 6 completed
Consider the titration of HC 2H 3O 2 with NaOH. If it requires 0.00376 mol of...
Consider the titration of HC 2H 3O 2 with NaOH. If it requires 0.00376 mol of NaOH to reach the endpoint, and if we had originally placed 14.49 mL of HC 2H 3O 2in the Erlenmeyer flask to be analyzed, what is the molarity of the original HC 2H 3O 2 solution?
4. You want to prepare a buffer with a pH of 9.00. You decide to use...
4. You want to prepare a buffer with a pH of 9.00. You decide to use NH3 and NH4CI, which has a pK-9.25. ( oase What ratio of [NH,)/[NH4ČI] is required to make this buffer? (5 points) a. PH-PKa tlog fA pLD-4.75 00
Buffer Practice 1.) You wish to prepare 750 mL of a buffer solution of pH =...
Buffer Practice 1.) You wish to prepare 750 mL of a buffer solution of pH = 7.00 and you decide to use NaH2PO4 as the acid, K2 = 6.2 x 10. You have on hand a 0.175 M solution of this acid. Kai = 7.5 x 103, Ka2 = 6.2 x 10-8, K3 = 4.2 x 10-13 a.) Calculate the pH of the NaH2PO4 solution. b.) Calculate the grams of Na2HPO4 that need to be added to 750 mL of...
ted A buffer solution made from CH3COOH and CH3COOK has a pH of 4.37. If p...
ted A buffer solution made from CH3COOH and CH3COOK has a pH of 4.37. If p K, for CH3COOH is 4.74 , what is the [CH3C00"] in the buffer? [CH3COOH [CH, C00"] [CH3COOH The pK, value for H2CO3 is 6.38. What mole ratio of NaHCO3 to H2CO3 is needed to prepare a buffer with a pH of 6.11? [HCO3-) [H2CO3]
Your lab TA asks you to prepare a buffer solution with a pH of 7.40. The...
Your lab TA asks you to prepare a buffer solution with a pH of 7.40. The following reagents are all available to you: 550 mL of 0.200 M formic acid, 450 mL of 0.200 M hypochlorous acid, solid sodium formate and solid sodium hypochlorite. a) Which 2 ingredients will you use to prepare the desired buffer? b) What is the base/acid ratio in the desired buffer? c) What mass (in g) of solid base must you dissolve in the corresponding...
6. You are to prepare 0.50 L ofa 0.10 M Phosphate buffer of pH 7.0. Determine...
6. You are to prepare 0.50 L ofa 0.10 M Phosphate buffer of pH 7.0. Determine the mass of ingredients you will weigh to prepare the buffer. Indicate the chemical names and the formula of the compounds you will use pka: 2.12 6.8 12.32 The mass of the chemicals are as follows: HP0: 98 NaH POs: 120 NaHPO: 142 Na POs: 164 (b) Give a brief procedure for preparing the buffer after you have weighed out the required amount of...
When you go to prepare the buffer described in the previous problem, you discover that your...
When you go to prepare the buffer described in the previous problem, you discover that your laboratory is out of sodium acetate. But you do have sodium hydroxide. How much (in mol and g) acetic acid and sodium hydroxide do you need to make the buffer? (Previous problem: You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acid plus acetate concentration of 250 mM and a pH of 5.0. What concentrations of...
You wish to make a buffer solution at a pH 9.56 with the weak acid HCN...
You wish to make a buffer solution at a pH 9.56 with the weak acid HCN (Ka = 6.9 x 10-10 ) and its salt, NaCN..What ratio of the concentration of conjugate base to the acid: ([A- ]:[HA]) is required to attain the desired pH? a. [A- ] is 2.5 × that of [HA] b. [A- ] is 5 × that of [HA] c. [A- ] is 1 × that of [HA] d. [A- ] is ½ × that of...
You wish to prepare an HC 2 H 3 O 2 buffer with a of 4.18 . If
the of is 4.65, what ratio of C 2 H 3 O 2 /HC 2 H 3 O 2 , must you
use ?
43) You wish to prepare an HC,H,O, buffer with a pH of 4.18. If the pK, of is 4.65, what ratio of CHO, THC,H,O, must you use? 44) A sample contains Ba,(PO.), Cds, AgCI, NH,CI, and ZnS. Which...
Question 6 -- / 1 You wish to prepare a buffer containing CH3COOH with a pH of 5.44. If the pka of acetic acid is 4.74, what ratio of [CH3C00-1/[CH3COOH] must you use? 0 5.0 2 1.4 3 0.70 4 1.1 © 0.20 4 of 6 completed
4. You want to prepare a buffer with a pH of 9.00. You decide to use NH3 and NH4CI, which has a pK-9.25. ( oase What ratio of [NH,)/[NH4ČI] is required to make this buffer? (5 points) a. PH-PKa tlog fA pLD-4.75 00
Buffer Practice 1.) You wish to prepare 750 mL of a buffer solution of pH = 7.00 and you decide to use NaH2PO4 as the acid, K2 = 6.2 x 10. You have on hand a 0.175 M solution of this acid. Kai = 7.5 x 103, Ka2 = 6.2 x 10-8, K3 = 4.2 x 10-13 a.) Calculate the pH of the NaH2PO4 solution. b.) Calculate the grams of Na2HPO4 that need to be added to 750 mL of...
ted A buffer solution made from CH3COOH and CH3COOK has a pH of 4.37. If p K, for CH3COOH is 4.74 , what is the [CH3C00"] in the buffer? [CH3COOH [CH, C00"] [CH3COOH The pK, value for H2CO3 is 6.38. What mole ratio of NaHCO3 to H2CO3 is needed to prepare a buffer with a pH of 6.11? [HCO3-) [H2CO3]
6. You are to prepare 0.50 L ofa 0.10 M Phosphate buffer of pH 7.0. Determine the mass of ingredients you will weigh to prepare the buffer. Indicate the chemical names and the formula of the compounds you will use pka: 2.12 6.8 12.32 The mass of the chemicals are as follows: HP0: 98 NaH POs: 120 NaHPO: 142 Na POs: 164 (b) Give a brief procedure for preparing the buffer after you have weighed out the required amount of...
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