To determine the critical micelle concentration CMC of sodium dodecyl sulfate SDS in water, you will need to measure the surface tension of SDS solutions at various concentrations and then plot the data. Here's a step-by-step guide on how to do this:1. Prepare SDS solutions with varying concentrations: Prepare a series of SDS solutions with different concentrations, for example, 0.1 mM, 0.5 mM, 1 mM, 2 mM, 5 mM, and 10 mM. Make sure to use distilled water to prepare the solutions.2. Measure the surface tension of each solution: Use a tensiometer to measure the surface tension of each SDS solution. A tensiometer is an instrument that measures the force required to detach a thin liquid film from a solid surface. Record the surface tension values for each concentration.3. Plot the data: Create a graph with the SDS concentration on the x-axis and the surface tension on the y-axis. Plot the data points for each concentration and surface tension value.4. Identify the CMC: The CMC is the concentration at which the surface tension starts to plateau or remain constant as the concentration increases. On the graph, this will be the point where the curve starts to level off. Draw a horizontal line at this point to determine the CMC value.5. Analyze the results: The CMC value represents the concentration at which SDS molecules begin to aggregate and form micelles in the solution. This information can be useful for understanding the behavior of SDS in various applications, such as detergents, emulsifiers, and biological research.By following these steps, you can determine the critical micelle concentration of sodium dodecyl sulfate in water using surface tension measurements.