Question

Name: ID: A 3. The dissociation of lactic scid is shown below: 0 OH он Lactic Acid Lactate Lactic acid has a pKa of 3.86 a. Which side of this equation is favored within a cell? Why? 3points) b. Draw in the appropriate orientation of water molecules on the most soluble side of the reaction. (2 points) A solution containing a mixture of lactie acid and lactate was found to have a pH of 3.67 c. Calculate the ratio of lactate concentration to the lactic acid concentration in this solution. (5 points) d. What fraction of the lactic acid/lactate mixture is lactic acid? (3 points)

Answer 1

a. The right side of the equation is favored (lactate and H⁺ ion) within a cell. because lactate is produced in various cells throughout the body including muscles, brain cells, and red blood cells and used as fuel by some tissues in the body. Also, It is a product of cellular metabolism process.

b. Lactic acid is a weak acid, that means some part of it (partially) dissociates in water which resulting in lactate and H+ ion.

Reaction: CH₃CH(OH)CO₂H + H₂O CH₃CH(OH)CO₂^- + H⁺

^{O given pKa = 3.86, pH = 3여 [HP) CHp) ConC raho 2}