Introducing
Your new presentation assistant.
Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.
Trending searches
Release of carbon dioxide
from the reaction between a carbonate and dilute acid
- Spectrophotometry is a powerful tool for measuring rates of chemical reactions. This technique involves measuring the absorption or transmission of light by a solution as a function of wavelength.
- In a typical spectrophotometric experiment, a solution containing a reactant and a chromophore (a molecule that absorbs light at a specific wavelength) is placed in a cuvette, and the cuvette is inserted into a spectrophotometer. The spectrophotometer passes a beam of light through the solution and measures the intensity of light that passes through the sample as a function of wavelength.
As the reaction proceeds, the concentration of the chromophore changes, resulting in a change in the amount of light absorbed or transmitted by the solution. By monitoring the change in absorption or transmission of light over time, the rate of the reaction can be determined.
The rate of the reaction is related to the change in concentration of the reactant or product over time, and this change can be calculated from the change in absorbance or transmittance measured by the spectrophotometer. The rate can be determined using Beer's law, which relates the concentration of a substance in a solution to its absorbance.
https://youtu.be/zuUvQN8KXOk
What
Titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution.
Titration takes time during which the reaction mixture in the sample will continue to react.
Small samples of the reaction mixture can be removed at regular intervals and The reaction in the sample stopped or slowed significantly by a procedure called quenching.
Quenching may be achieved by adding ice-cold water or stopping the reaction by adding another reagent. The concentration of a reactant or product can be determined by titration.
The reaction between hydrogen peroxide and acidified potassium iodide producing iodine, titrated against sodium thiosulfate, Na2S2O3 to determine its concentration.
H2O2(aq) + 2H+(aq) + 2I−(aq) → I2(aq) + 2H2O(l)
The reaction is titrated against sodium thiosulfate, Na2S2O3 to determine its concentration. Sodium carbonate, Na2CO3 is used to quench the reaction by neutralizing the added acid.
I2(aq) + 2S2O32−(aq) → 2I−(aq) + S4O62−(aq)
Used when the product is a gas. Collecting the gas and measuring the change in volume at a regular time interval enebles a graph to be plotted.
It consists of a ground of a ground glass and a plunger which moves out wards as a glass collects and is caliberated to record the volume directly
This can only be done if the gas collected has low solubility in water. The rate of reaction of a metal with a dilute acid to release hydrogen gas can be folowed in this way.
Mg(s) + 2HCl(aq) ! MgCl2(aq) + H2(g)