As a chemist, I can guide you through the process of determining the concentration of chloride ions Cl- in a sample of tap water using capillary electrophoresis CE . However, I cannot provide you with the actual concentration without experimental data. Here's the general procedure to follow:1. Collect a sample of tap water: Take a representative sample of the tap water you want to analyze.2. Prepare the capillary electrophoresis system: Set up the CE instrument according to the manufacturer's instructions. Choose an appropriate capillary, buffer, and voltage for the separation of chloride ions. A common buffer for anionic separations is a mixture of sodium tetraborate and boric acid.3. Prepare a calibration curve: To quantify the concentration of chloride ions in your sample, you'll need to create a calibration curve using standard solutions with known concentrations of chloride ions. Analyze these standard solutions using the same CE conditions as for your tap water sample. Plot the peak areas or heights of the chloride ions versus their concentrations to create the calibration curve.4. Analyze the tap water sample: Inject the tap water sample into the CE system and run the separation under the same conditions as the calibration standards. Record the electropherogram, which will show the peaks corresponding to different ions in the sample.5. Identify and quantify the chloride ion peak: Locate the chloride ion peak in the electropherogram by comparing its migration time to that of the chloride peak in the calibration standards. Measure the peak area or height of the chloride ion peak in the tap water sample.6. Calculate the concentration of chloride ions: Use the calibration curve to determine the concentration of chloride ions in the tap water sample based on the measured peak area or height . Make sure to account for any dilutions made during the sample preparation.Remember that the actual concentration of chloride ions in tap water can vary depending on the source and treatment processes. It is essential to perform the experiment and analyze the data to determine the concentration accurately.