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5. Ascorbic acid is likely stored somewhere in your home today. It is commonly known as...
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5. Ascorbic acid is likely stored somewhere in your home today. It is commonly known as Vitamin C. Its conjugate base, ascorbate, has a pKb equal to 9.83. What is the pOH of a 0.65 M solution of ascorbic acid? (Include the equilibrium concentrations of each component in the reaction.) (14 points)
4.48 The weak base colloquially known as Tris, and more precisely as tris(hydroxymethyl)aminomethane, has pK, = 8.3 at 20°C and is commonly used to produce a buffer for biochemical applications. (a) At what pH would you expect Tris to act as a buffer in a solution that has equal molar concentrations of Tris and its conjugate acid? (b) What is the pH after the addition of 3.3 mmol NaOH to 100 cm3 of a buffer solution with equal molar concentrations...
5. Neville Shortop, a budding bioorganic chemist, extracted ascorbic acid (Vitamin C, H2C6H606) from several lemons and oranges. If his purified solution of vitamin C was found to be 0.325 M, Calculate the pH, POH, (H2CH 061. (HC.H606) and [CH6061 at equilibrium. Make sure to CLEARLY CIRCLE your final answer for each item asked. The base ionization constants are as follows: Kb1 = 3.73 x 10"; Kb2 = 1.50 x 10-10
When dealing with buffer systems, we often use the acid reaction to determine the equilibrium and set up the ICE table. The most common experimental method used to study acid-base systems is titration, which studies the stoichiometric addition of the acid to a base solution or the base to an acid solution to determine the value of K, or K, The value of the pK, or pK, is essential to the understanding of the buffer system, where pK, = -log...
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...
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DIRECTIONS: A COMPLETE THE ANSWER SHEET: Write your name. banner id # and the date in the space the scantron. All answers must be on the seantron and this exam. Read each item carefully select the word phrase or expression that best completes the fest item. Indicate the answer by blackening the appropriate space on your answer sheet You MUST erase completely to receive credit for an erased item. This AND the scantron must be turned in. All...
Critical Skills 9 Acid-Base Equilibria) Due: 6 pm Monday March 30 upload to Gradescope Class time: 9:30 11:00 2:00 (from back of page) 1. Consider the conjugate acid-base pair NHA and NH, a. Write the acid dissociation (ionization) reaction for NHA" in water. Hint: NH."(aq) + HOME? Label each conjugate acid-base pair. b. Write the expression for equilibrium constant for this reaction ( ?) c. Write the base dissociation (Ionization) reaction for NH, in water. Hint: Nyaq) + HOS Label...
R-0.08206 (atm - L)(mol - K)= 8.314 J/(mol-K) pH = -log[H30) pOH = -log(OH) pX=-logX [HO'] = 10 Ph. K, EK.(RT) pH + pOH = 14 = pK+pKb [OH (H:0= 10-14 = K, * Ks (in water at 25°C) pH =pK, + log([base)/(acid]) pOH =pKy + log (acid]/[base]) Molar Solubility = (*+ m for a salt that dissociates into ions with coefficients of n and m - b b -4ac where 0 = ax + bx+c VA= A/ X=- 1)...
7. What is the pH of a solution containing 5.3 x the pH of a solution containing 53 105 M hydroxide ion concentration a. 5.72 d.-4.27 b. 4.27 e.-9.72 C. 9.72 8. What is the H what is the pH of a solution containing o ly Macetic acid (K of acetic acid is 1.8 x 10") a. -0.77 d. 2.92 b. 1.98 e. 3.49 c. 2.22 -10). What is 9. One of the strongest acids known is called fluorosulfonic acid,...
7. What is the pH of a solution containing 5.3 x the pH of a solution containing 53 105 M hydroxide ion concentration a. 5.72 d.-4.27 b. 4.27 e.-9.72 C. 9.72 8. What is the H what is the pH of a solution containing o ly Macetic acid (K of acetic acid is 1.8 x 10") a. -0.77 d. 2.92 b. 1.98 e. 3.49 c. 2.22 -10). What is 9. One of the strongest acids known is called fluorosulfonic acid,...