1) The options for the first question are wrong.
the dissociation constant of oxalic acid, ka is 6.0 x 10-2. pKa = -log ka = -log ( 6.0 x 10-2)= 1.22.
The range of pH buffered by oxalic acid and sodium oxalate is pH=pKa 1 = 1.22 1.
so, the range would be 0.22 to 2.22.
11) the correct option is the second one. 0.75 NaH2PO4 and 1.0 Na2HPO4
please help biochem Which range of pH is buffered by a oxalatic acid/sodium axalate buffer? 0...
Biochem help molecule c molecule d QUESTION 6 Absorption of drugs into the body is based on multiple factors including ionization state, surface area of the stomach and intestines, and other physical properties of the drug. A novel drug contains a carboxylic acid functional group with a pKa value of 3.24.. Based on ionization states alone, would you predict that it is better absorbed (ie passes through a lipid membrane) in the stomach where the pH is about 2, or...
i want answer to all questions please Answer: 29) Consider the following generalized buffer solution equilibrium: When a small amount of a strong base such as sodium hydroxide is added to the solution, which of the four species shown would experience an increase in concentration? A) BH B)H C) HO D)B E None of the species would increase in concentration. Answer: ( 30) What is true about a solution whose pH is less than 7 at 25°C? A) It has...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
Determine which weak acid is the best option to make a buffer at the specified pH of 3.00. ***formic acid, ?a=1.77×10−4, 2.00 M propionic acid, ?a=1.34×10−5, 3.00 M phosphoric acid, ?a=7.52×10−3, 1.00 M acetic acid, ?a=1.75×10−5, 5.00 M Determine which conjugate base is the best option to make a buffer at the specified pH. sodium dihydrogen phosphate monohydrate, NaH2PO4⋅H2O ***sodium formate, HCOONa sodium acetate trihydrate, CH3COONa⋅3H2O sodium propionate, CH3CH2COONa The final volume of buffer solution must be 100.00 mL and...
help with 5 and 6 please 5. Choose the effective pH range of a HF/Naf buffer. For HF, Ka = 3.5 x 10-4 6. If a small amount of a strong acid is added to buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA, the pH of the buffer solution does not change appreciably because a) the Ka of HA is changed. b) the strong acid reacts with Ato give HA, which...
1. What is the pH of a hypoiodous acid/sodium hypoiodite buffer in which the concentration of the weak acid component is 0.129 M and the concentration of the conjugate base is 0.102 M?Ka=2.3E-11. 2. The pH of a hypoiodous acid/sodium hypoiodite buffer in which the concentration of the weak acid component is 0.140 M and the concentration of the conjugate base is 0.070 M is 10.34. Suppose 0.128 g of solid NaOH are added to 100 mL of this buffer...
(A) Which of the following combinations will give a buffered solution that has a pH of about 5? Explain clearly the reason for your choice. 1.7x10") a) NH, mixed with NH,CI (K, for NH,= 1.8 x10) b) C,HsN mixed with C;H;NHCI (K for CsHsN or (B) What ratio of the concentrations of the conjugate acid/base pair from Part A will be needed to form a buffer solution with a pH of 6.2?
A buffer is a solution that is a mixture of either a weak acid and its conjugate base or a weak base and its conjugate acid. When strong acids or strong bases are added, buffers either accept protons when they are in excess or donate protons when they have been depleted to minimize changes in pH. Which of the statements correctly describe the properties of a buffer? Select one or more: a. The weak base of an alkaline buffer will...
In the Phosphate Buffer System Experiment, which solution had the greatest change in pH after the addition of hydrochloric acid? A) Na2HPO4 B) Na2HPO4+NaH2PO4 C) NaH2PO4 D) H2O
Which of the following are accurate descriptions of buffer solutions? 1. If a solution is buffered, its pH is nearly neutral. II. The mechanism by which buffered solutions resist pH changes is not well understood. III. Addition of strong acid to a buffer shifts the equilibrium such that Ht is consumed. IV. If strong base is added to a buffer, it reacts with the acid component of the mixture. V. Buffers only work well if the one conjugate is present...