Question
In: Chemistry
Lactic acid is a by-product when glucose is burned anaerobically (without using oxygen) which is utilized...
Lactic acid is a by-product when glucose is burned anaerobically (without using oxygen) which is utilized by mammalian muscles under exertion. In solution, lactic acid can produce H3O+. The reaction can be written as either: lactic acid(aq) + H2O(l) <---> lactate(aq) + H3O+(aq) or C3H6O3(aq) +H2O(l) <---> C3H5O3-(aq) + H3O+(aq) The equilibrium constant for this reaction at 25oC is 8.3 x 10-4. a) What is ∆Go at 25oC? Is the reaction spontaneous under standard conditions? Explain. b) The biological standard condition has all concentrations at 1 M except for H3O+ which is 1.0 x 10-7 (the value at a pH of 7) and the temperature is 37oC. What is ∆G under these conditions? Would the reaction be spontaneous? Explain.
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
Part A) A 0.5865-g sample of lactic acid (HC3H5O3) is burned in a calorimeter whose heat...
Part A) A 0.5865-g sample of lactic acid
(HC3H5O3) is burned in a calorimeter whose heat capacity is 4.812
kJ/°C. The temperature increases from 23.10 °C to 24.95 °C.
Calculate the heat of combustion of lactic acid per mole.
Part B) The
enthalpy of reaction for the combustion of C to
CO2 is –393.5
kJ/mol C, and the
enthalpy for the combustion of CO to CO2 is –283.0
kJ/mol.
Calculate the enthalpy for the combustion of C to CO:
Part...
Animals do not produce alcohol in the presence of oxygen. Instead they produce lactic acid. Describe...
Animals do not produce alcohol in the presence of oxygen.
Instead they produce lactic acid. Describe the effects of lactic
acid on animals.
Under anaerobic conditions, glucose is broken down in muscle tissue to form lactic acid according to...
Under anaerobic conditions, glucose is broken down in muscle
tissue to form lactic acid according to the reaction:
C6H12O6 → 2 CH3CHOHCOOH
Use data from the 'official' tables available in the BCH341
website in addition to the heat capacities for glucose and lactic
acid given below:
Assume all heat capacities are constant from T = 298 K to T =
310 K.
For glucose, Cop,m=218.2JK.mol
For lactic acid, Cop,m=127.6JK.mol
Note: All thermodynamic quantities in this problem are per mol
of glucose.
Be...
Under anaerobic conditions, glucose is broken down in muscle tissues to form lactic acid according to...
Under anaerobic conditions, glucose is broken down in muscle
tissues to form lactic acid according to the reaction, C6H12O6(s) →
2CH3CHOCOOH(s). Thermodynamic data for glucose and lactic acid at
298 K are given below. ΔHfº (kJ/mol) Cp.m (J/mol∙K) Smº (J/mol∙K)
Glucose −1273.1 219.3 209.2 Lactic Acid −673.6 127.6 192.1 (a)
Calculate ΔS for the system, surrounding and universe at T = 325 K.
Assume the heat capacities are constant between 298 K and 325 K.
(b) Is this reaction spontaneous...
Lactic acid is a common by-product of cellular respiration and is often said to cause the...
Lactic acid is a common by-product of cellular respiration and
is often said to cause the "burn" associated with strenuous
activity. A 25.0 mL sample of 0.109 M lactic acid (HC3H5O3, pKa =
3.86) is titrated with 0.109 M NaOH solution. (Assume that all
solutions are at 25°C.) (a) Calculate the pH after the addition of
the following amounts of NaOH. Vol. NaOH added pH 0 mL 4.0 mL 8.0
mL 12.5 mL 20.0 mL 24.0 mL 24.5 mL 24.9...
Lactic acid is a common by-product of cellular respiration and is often said to cause the...
Lactic acid is a common by-product of cellular respiration and
is often said to cause the "burn" associated with strenuous
activity. A 25.0 mL sample of 0.109 M lactic acid
(HC3H5O3,
pKa = 3.86)
is titrated with 0.109 M NaOH solution. (Assume that
all solutions are at 25°C.)
(a)
Calculate the pH after the addition of the following amounts of
NaOH.
20.0 mL
24.0 mL
24.5 mL
24.9 mL
25.0 mL
25.1 mL
26.0 mL
28.0 mL
30.0 mL
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 27.6...
When carbon is burned in air, it reacts with oxygen to form
carbon dioxide. When 27.6 g of carbon were burned in the presence
of 84.9 g of oxygen, 11.3 g of oxygen remained
unreacted. What mass of carbon dioxide was produced?
In anaerobic cells glucose C6H12O6 is converted to lactic acid: C6H12O6 → 2CH3CH(OH)COOH. The standard enthalpies...
In anaerobic cells glucose C6H12O6 is converted to lactic acid:
C6H12O6 → 2CH3CH(OH)COOH. The standard enthalpies of formation of
glucose and lactic acid are –1274.45 and –694.04 kJ/mol,
respectively. The molar heat capacities (at constant pressure) for
glucose and lactic acid are 218.86 and 127.6 J/mol K,
respectively.
(4.a) Calculate the molar
enthalpy associated with associated with the formation
lactic acid from glucose at 298 K.
(4.b) What would the quantity in part (4.a) be
if the reaction proceeded at...
A 17.2−g sample of white phosphorus was burned in excess of oxygen. The product was dissolved...
A 17.2−g sample of white phosphorus was burned in excess of
oxygen. The product was dissolved in enough water to make 567 mL of
solution. Calculate the pH of the solution at 25°C.
pH=
A 24.7-g sample of white phosphorus was burned in excess of oxygen. The product was dissolved...
A 24.7-g sample of white phosphorus was burned in excess of
oxygen. The product was dissolved in enough water to make 549 mL of
solution. Calculate the pH of the solution at 25 C
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