What happens during iodination of acetone?

What happens during iodination of acetone?

Iodine gives a deep yellowish brown color in aqueous solution. As acetone is iodinated and Iodine is converted to iodide ion, this color slowly fades as iodine is consumed. Thus iodination of acetone can be investigated by the change in absorbance.

What is the rate determining step in the iodination of acetone?

The rate law for acetone iodination is rate= k[Acetone][H+]. The average value of k calculated from the three trials was found to be about 2.32e-5 M-1s-1.

What can you conclude about the effect of concentration of the rate of chemical reaction?

When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.

Why is the iodination of acetone important?

The iodination of acetone is a particularly convenient and interesting reaction to study kinetically. The progress of the reaction is easily followed by directly observing the decrease in iodine concentration spectrophotometrically at a wavelength where none of the other reagents has significant absorption.

What is meant by iodination?

Definitions of iodination. the substitution or addition of iodine atoms in organic compounds. type of: chemical action, chemical change, chemical process. (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved.

What are the four factors that affect reaction rates?

The factors that affect reaction rates are:

• surface area of a solid reactant.
• concentration or pressure of a reactant.
• temperature.
• nature of the reactants.
• presence/absence of a catalyst.

How does concentration affect the rate of reaction collision theory?

Collision theory explains why most reaction rates increase as concentrations increase. With an increase in the concentration of any reacting substance, the chances for collisions between molecules are increased because there are more molecules per unit of volume.

Why does the rate of reaction goes on decreasing with time?

Reactions usually slow down as time goes on because of the depletion of the reactants. The rate constant, or the specific rate constant, is the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

What is the activation energy for the iodination of acetone?

Second-order kinetics concerning acetone and HCl was identified with activation energy of 67.86 kJ/mol.

What is tyrosine iodination?

Iodination of tyrosine residues in thyroglobulin is a key step in thyroid hormone biosynthesis. In one sense, therefore, it is not surprising that excess iodine can lead to increased thyroid hormone production. However, there are mechanisms to control thyroid hormone overproduction in these situations.

Why does an iodine deficiency cause a goiter?

Iodine deficiency is the most common cause of goiter. The body needs iodine to produce thyroid hormone. If you do not have enough iodine in your diet, the thyroid gets larger to try and capture all the iodine it can, so it can make the right amount of thyroid hormone.

What is the rate of iodination of acetone?

The rate of iodination of acetone has been measured as a function of temperature in the binary solvent isobutyric acid (IBA) + water near the upper consolute point. The reaction mixture was prepared by the addition of acetone, iodine, and potassium iodide to IBA + water at its critical composition of 38.8 mass % IBA.

What is the value of K in [acetone]?

By using the values of [Acetone], [H + ], and the rate, and taking the average of the three trials, the value of k was found to be 2.32e-5 M -1 s -1. The goal of determining the values of k, the exponents x and y, and the rate of disappearance of I 2 were successfully met.

How does the concentration of acetone and H+ affect the reaction rate?

The expected results matched up with the obtained results—the concentration of acetone and H + are directly related to the rate of reaction. Both [Acetone] and [H +] are first-order reactions, resulting in an overall second-order reaction.

Is acetone a first order or second order reaction?

Both [Acetone] and [H +] are first-order reactions, resulting in an overall second-order reaction. The main source of error in the lab came from not correctly measuring out the substances, resulting in a very askew time and rate of reaction.