To determine the concentration of chloride ions in a seawater sample using potentiometry, you can use an ion-selective electrode ISE method, specifically a chloride-selective electrode. The following steps outline the procedure:1. Collect a seawater sample from the Atlantic Ocean off the coast of Miami, Florida.2. Prepare a series of chloride ion standard solutions with known concentrations to create a calibration curve. These solutions should cover the expected range of chloride ion concentrations in seawater.3. Calibrate the chloride-selective electrode by measuring the potential voltage of each standard solution and plotting the potential versus the logarithm of the chloride ion concentration. The resulting calibration curve should be linear, with the slope representing the electrode's sensitivity.4. Measure the potential of the seawater sample using the calibrated chloride-selective electrode.5. Determine the chloride ion concentration in the seawater sample by comparing its potential to the calibration curve.The sensitivity of the measurement depends on the electrode used and the quality of the calibration curve. Typically, chloride-selective electrodes have a sensitivity of around 56-59 mV per decade change in chloride concentration, which allows for accurate determination of chloride concentrations in seawater.The typical range for chloride ion concentration in seawater is approximately 19,000 to 23,000 mg/L parts per million . After measuring the chloride ion concentration in the seawater sample using potentiometry, you can compare the result to this range to determine if the sample falls within the expected values for seawater.