PH= 1/2Pka- 1/2logC
= 1/2(3.1) - 1/2 log 0.05
= 1.55 - 1/2(-1.3010)
= 1.55 + 0.6505
= 2.20
28. Lactic Acid (HC3H5O3) has a pKa of 3.1. What is the pH of an aqueous...
What is the pH of a 1.00 L solution containing 0.295 M lactic acid, HC3H5O3 (pKa = 3.86) and 0.295 M sodium lactate, NaC3H5O3, upon the addition of 0.055 mol HCl? Assume no significant volume change occurs.
12. Lactic acid (HC3H5O3) is present in sour milk It is a monoprotic acid. In a 0.100 M solution of lactic acid, the pH is 2.44 at 25°C. Calculate Ka and pKa for lactic acid at that temperature. (10)
Please answer both 24 & 27 22. Calculate the pH of a 0.0120 M lactic acid solution. HC3H5O3, K = 1.36x10 23. Find the pH of 0.388 M lithium butanoate solution, LIC,H,O,(aq). Butanoic acid Kg = 1.52x10° 24. Calculate the percent ionization for a 0.0240 M hypochlorous acid solution. The K, for hypochlorous acid is 3.4x10 25. Nicotine is a weak base (C10H24N2, Kb = 1.0x10'). A researcher prepares a solution containing 0.300 M nicotine and 0.050 M NaOH. Determine...
A buffer solution is made such that the initial concentrations of lactic acid (HC3H5O3) and the lactate ion (C3H5O3-) are both 0.600 M. What is the resulting pH if 10.0 mL of 1.00 M HCL is added to 0.500 of the buffer solution? (ka of HC3H5O3= 1.4 x 10^-4)
10. (a) Determine the pH of 0.10 M lactic acid (HC3H5O3) (b) What is the pH of a buffer that is 0.12 M lactic acid and 0.10 M sodium lactate (NaC2H5O3)? For lactic acid. Ka - 1.4 x 104. (10) 11. Hydrazine, N2H4, is a weak base. Write the equation for the reaction of hydrazine with water and write the expression for Kb. (5) Na Hj
A student performs a titration of 25.0 mL of 0.100 M lactic acid (HC3H5O3), using 0.050 M sodium hydroxide (NaOH). The Ka for lactic acid is 1.4 x 10-4. a) (10 points) What is the pH of the solution after the addition of 23.5 mL of sodium hydroxide solution? b) (4 points) How many milliliters of NaOH are required to reach the equivalence point? c) (4 points) Write the chemical reaction that will determine the pH of the solution at...
1. Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.010 M and the concentration of lactate is 0.087 M, the pH is 4.80 B. Calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30 C The pH of a 0.20 M sodium acetate buffer is 5.1. The pKa of acetic acid is 4.76. Explain in details (showing all calculation) how to prepare the buffer...
A. Calculate the pH of a solution containing 0.2M lactic acid (pKa = 3.86) B. Calculate the pH of a solution of 1x10^-9 M HCl (strong acid) in distilled water. Show your work.
27. What is the pH of an aqueous solution that contains 0.35 M of lactic acid, HC3H5O2, (Ka = 4.4 X 10 -4 ) and 0.55 M of Nat C3H5O2 - ? a. 2.77 b. 3.55 C. 4.65 d. 7.35 e. 5.89
8. Lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid? A. 1.1% B. 2.2% C. 4.8% D. 14% E. None of these choices are correct.