Determining Rate Constant for Hydrolysis of Ethyl Lactate with Acid Catalysis?

Is the acid a reactant or a catalyst?In summary, the conversation is discussing the hydrolysis of ethyl lactate and determining the rate constant from experimental data. The titrations with NaOH are used to measure the concentration of OH- and ethyl lactate, while the kinetics data tracks the reaction time and changes in volume of NaOH. The rate equation and standardization equations are used to calculate the rate constant, but further clarification is needed on the role of OH- and the type of catalysis being studied.
  • #1
sarahrpol
1
0

Homework Statement


Hydrolysis of ethyl lactate

Determine the value of the rate constant for the hydrolysis of ethyl lactate from the following data.

Mass of ethyl lactate (grams): 0.5956
Concentration of stock HCl solution (M): 0.01023

Standardization titration volumes (of NaOH):

Run Vi (mL) Vf(mL)
1 0.60 15.58
2 15.58 30.66
3 30.66 45.66

Kinetics data:
Run Reaction time (seconds) Vi(mL) Vf(mL)
0 0
1 308 1.72 4.32
2 742 4.32 8.88
3 1303 8.88 14.84
4 1910 14.84 21.66
5 2550 21.66 29.06

Rate constant = ?

Homework Equations


equations are below

The Attempt at a Solution


the rate equation is -d[OH-]/dt = k[OH-][EtL]

but I'm not sure how to find the concentration of OH and the concentration of Ethyl lactate is 0.01203

and then a = 1/2[OH-]o + [Etl]o
1/a-x - 1/a = kt
 
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  • #2
What are the titrations for? What do they determine?

OH- is just a catalyst and its concentration doesn't change during the hydrolysis, so your rate equation can't be right.
 
  • #3
This is really not set out clearly enough to understand or help with.
What are Vi, Vf? What is measured how?
Is this acid catalysis?
 

1. What is the definition of chemical kinetics?

Chemical kinetics is the branch of chemistry that studies the rates of chemical reactions and the factors that influence them.

2. Why is understanding chemical kinetics important?

Understanding chemical kinetics allows scientists to predict and control the rate of a chemical reaction, which is essential in industries such as pharmaceuticals, food production, and environmental protection.

3. What are the factors that affect the rate of a chemical reaction?

The factors that affect the rate of a chemical reaction include temperature, concentration of reactants, presence of a catalyst, and surface area of reactants.

4. How can I determine the rate of a chemical reaction?

The rate of a chemical reaction can be determined by measuring the change in concentration of reactants or products over time. This can be done using techniques such as spectrophotometry, titration, or gas chromatography.

5. What is a reaction mechanism?

A reaction mechanism is the series of elementary steps that occur in a chemical reaction, leading to the overall reaction. It explains the pathway and intermediates involved in the reaction.

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