mass of lactic acid = 9.20 g
moles of lactic acid = 9.20 / 90.08 = 0.102 mol
mass of sodium lactate = 11.15 g
moles of sodium lactate = 11.15 / 112.06
= 0.0995 mol
pKa = 3.86
pH = pKa + log [salt / acid]
= 3.86 + log [0.0995 / 0.102]
pH = 3.85
calculate the pH of the solution being prepared Calaulate the pH of lactic acid (90 08glml...
A buffer is prepared by adding 0.15 mol of lactic acid, CH3CHOHCOOH, and 0.20 mol of sodium lactate, Na+CH3CHOHCOO - , to sufficient water to make 1.0 L of buffer solution. The Ka of lactic acid is 1.4 x 10 - 4. Calculate the pH of the buffer.
Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of a 1.0M sodium lactate. (pka of lactic acid = 3.86) Calculate the change in pH that occurs when 0.01moles of OH are added to a 1L buffered solution that contains 0.5M acetic acid (HC_2H_3O_2) and 0.5M acetate ion (C_2H_3O_2). Acetic acid pka = 4.76.
3. What is the pH of a buffer solution that is 0.266 M in lactic acid and 0.14 M in sodium lactate? The K, of lactic acid is 1.68 x 10-4.
9. A buffer solution was prepared by mixing 12.0 mL of 0.12 mol L lactic acid (HLac) with 18.0 mL of 0.16 mol L sodium lactate (NaLac). Kallactic acid) = 1.4 x104. (10 marks) a) Calculate the pH of the solution. Write all relevant chemical equations. State and verify any assumptions you make. 1/6] b) Two 200-ml buffer solutions were prepared with the same pH using different pairs of compounds, as outlined in the table below. Which of these two...
Lactic acid is a simple organic acid that is somewhat stronger than acetic acid. The lactate ion is the conjugate base of lactic acid and is one product of animal (including human) metabolism. Ka for lactic acid is 1.38 x 10-4. If the resting amount of lactate in blood is 2.0 mM and typical blood pH is 7.40, what is the lactic acid concentration in blood? Calculate the pH of a 0.0100 M solution of lactic acid. Calculate the pH...
2. (a) Determine the pH of 0.10 M lactic acid (HC3HSO3) (b) What is the pH of a buffer that is 0.12 M. lactic acid and 0.10 M sodium lactate (NaC3H5O3)? For lactic acid. Ka = 1.4 x 10-4. (10)
A lactic acid solution is prepared by dissolving 0.67 g of lactic acid (HC3H5O3) in 100.00 mL of water. The pH is found to be 2.50. Calculate the Ka for lactic acid.
Lactic acid, HC3H5O3, is a substance found in sour milk products such as yogurt, and is produced naturally by fermentation in body cells during normal metabolism and exercise The Ka for lactic acid is 38 x 10-4. Its sodium salt, sodium lactate, NaC3H5O3, is used in foods as a preservative and acidity regulator. It is also used in shampoo products as an effective humectant and moisturizer. Determine the pH of a solution prepared by adding 4.5 grams of sodium lactate...
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
Lactic acid, HC3H5O3, is a substance found in sour milk products such as yogurt, and is produced naturally by fermentation in body cells during normal metabolism and exercise The Ka for lactic acid is 38 x 10-4. Its sodium salt, sodium lactate, NaC3H5O3, is used in foods as a preservative and acidity regulator. It is also used in shampoo products as an effective humectant and moisturizer. Determine the pH of a solution prepared by adding 4.5 grams of sodium lactate...