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lab report - Names Analyzing Different Heartburn...

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Names: __________________________ __________________________ __________________________ __________________________ Analyzing Different Heartburn Medications in Terms of Buffering Capacity Section 1: Methods Part A (Day 1): Using a digital pH meter, the number displayed represents the substance’s pH level. There are two different types of meters that can be used for reading pH, which are analog and digital. In this lab, the digital pH meter is the desired control that will be used. When using a pH meter, calibration is necessary to receive the most accurate reading for the buffering capacity. The proper way to calibrate a pH meter is to place the electrode into solutions with a designated pH; with the pH of 4, 7, and 10. Place the meter into the one of the solutions, if the meter is off with the reading, adjust the screws on top of the meter to the desired pH level, repeat this step for the other pH solutions. Once placed and adjusted to the different solutions of pH calibration is complete. The next step in this lab is to pour 40 mL of solution (pH 10) into a 100 mL beaker. Immerse the electrode into the solution and swirl either the beaker or meter, once that is complete the read the number that the meter gives off, that will be the most accurate pH reading. Add approximately 1.0 mL of 0.1M HCL and repeat the steps for reading the pH, continue adding 1.0 mL of HCL until 10.0 mL have been added (recorded all the pH levels for the increments of 1.0 mL added because this will be used for graphing the buffering capacity). Once 10.0 mL of HCL are added, rinse the electrode and dispose of this solution, retrieve 40 mL of the same pH solution (pH 10) used for this lab then repeat the procedure using 0.1M of NaOH in increments of 1.0 mL up until 10.0 mL are added. Record pH levels. Once this section of this lab is complete, plot the results on a graph and answer the questions given in the lab manual. The graph will best determine the buffering capacity for the pH. Part B (Day 2): In this lab, groups will be measuring the pH of a brand and generic substance; this will show which of the two substances is a better buffer. Similar to the previous lab, recording the pH levels when adding an acid (HCL) and a base (NaOH) will be necessary to make a conclusion of which of the substance is a better buffer. The two substances being use will be the brand name Mylanta versus the generic brand Kroger’s Antacid. First, calibrate the digital pH meter once again, then obtain 20 mL of Mylanta and record the original pH. Next add 1.0 mL of 0.1M HCL at a time and record the pH keep repeating this step until 10.0 mL are added into the substance. Remember to record the pH of each 1.0 mL added. Dispose of the mixture and take another 20 mL of Mylanta and repeat the previous procure but this time add 1.0 mL of 0.1M NaOH. Repeat until 10.0 mL are added and record the pH levels of every 1.0 mL that is added. Repeat this entire
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procedure but use 20 mL of the generic, Kroger’s Antacid brand. Record your data for
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