Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7?Ionization Constants for Aqueous Weak Acids at 25 °CAcid K. (pK,)Conjugate BaseHydrogen phthalate ion,Cg H4(CO2H)(CO2)Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74)Weak AcidPhthalic acid,C6 H4 (CO,H)21.3 x 10-3 (2.89)Dihydrogen phosphate Hydrogen phosphateion, H2 PO4Hydrogen phosphateion, HPO426.2 x 10-8 (7.21)ion, HPO,2-Phosphate ion, PO,*3.6 x 10-13 (12.44)O Na, HPO4 and NagPO4O NaH2 PO4 and NazHPO4O H;PO4 and NaH2 PO4

Ans- NaH2PO4 and Na2HPO4 would be the best choice to buffer the pH of a solution because it has pka…

Answered: Which of the following combinations…

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter2: Atoms And Molecules: The Chemical Basis Of Life

Section2.6: Acids, Bases, And Salts

Problem 1C

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At a pH of 7.40, the carbonic acid ratio is ________. a. 35:1 b. 4:1 c. 20:1 d. 3:1
What is the pH of the following buffer mixtures? (a) 100 mL 1 M acetic acid plus 100 mL 0.5 M sodium acetate (b) 250 mL 0.3 M phosphoric acid plus 250 mL 0.8 M KH2PO4
Three buffers are made by combining a 1M solution of acetic acid and a 1M solution of sodium acetate in the ratios shown in the table below. Which of these statements is true regarding the prepared buffers? (Ka= 1.7x10-5) pH of buffer 1 < pH of buffer 2 < pH of buffer 3 pH of buffer 1 = pH of buffer 2 = pH of buffer 3 pH of buffer 1 > pH of buffer 2 > pH of buffer 3 pH of buffer 1 = pH of buffer 2 > pH of buffer 3 pH of buffer 1 > pH of buffer 2 = pH of buffer 3
The normal range of the sodium electrolyte in the body is 134 to 145 mEq/L. The term mEq is dependent on the charge of the ion. Since sodium is a +1 ion, 134 mEq/L is the same as 134 mmol/L. An ion that has a greater positive or negative charge; however, will have 1 mEq for each positive or negative charge of the ion for every 1 mmol. For example, for Ca+2, 2mEq/1mmol. If the standard range of Magnesium in the body is 0.70 to 0.95 mmol/L, convert this value into mEq/L for the Mg2+ ion. (Use dimensional analysis to figure this out)
The pH of human blood is buffered at 7.35 to 7.45. If the [OH-] of the blood sample is 6.3x10-6, calculate its pH value. Is the patient’s pH within the range? Or is experiencing acidosis or alkalosis condition?
Bicarbonate/carbonic acid buffer in blood is an example of an equilibrium reaction that is meant to be very insensitive to change. How does the bicarbonate/carbonic acid buffer re-establish equilibrium if acidity increases? How does the bicarbonate/carbonic acid buffer re-establish equilibrium if alkalinity increases?
If there is an increase in the hydrogen ion concentration from 38 nmol.l-1 to 82 nmol.l-1, what does the pH change from and to?
Based on the Henderson-Hasselbalch equation (shown below), calculate the pH when half of a solution of acetic acid is dissociated to acetate (the pKa of acetic acid is 4.76). A. 1.00 B. 3.76 C. 4.76 D. 5.76
A glucosamine solution of unknown concentration was diluted as follows: 1 mL of the solution was diluted to 5.0 mL. A 0.3 mL aliquot of this solution was diluted with 0.7 mL of water; the absorbance of this was measured and found to be 0.440 (uncorrected, must subtract blank). What is the concentration of the original undiluted glucosamine hydrochloride solution in µmol/mL? Given: Corrected absorbance = 0.395 y= 1.165x+0.055 Standard equation
An aqueous solution contains 0.448 M dimethylamine ((CH3)2NH).How many mL of 0.240 M hydroiodic acid would have to be added to 150 mL of this solution in order to prepare a buffer with a pH of 10.500? ______________ml
To make up a solution of phosphate buffered saline (PBS), you need 10 mM Na2HPO4 (anhydrous) (FW: 141.96 g/mol), 3 M NaCl (FW: 58.44 g/mol), and 5mM KH2PO4 (FW: 136.09 g/mol). How many grams of each will you need to make up 850 mL of PBS?

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