Solutions, Acids, And Bases

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It is very important to understand solutions, acids, and bases. The purpose of this experiment was to test the buffering ability of 4 substances. These consisted of water, milk, NaCl, and phosphate and were measured on the pH scale. PH is a measure of acidity or basicity, pH less than seven is acidic and solutions with a pH higher than seven are basic. An acid is a chemical compound that dissociates in a solution and releases hydrogen ions which lowers the pH. A base is the opposite so it donates hydrogen ions making the pH rise. A compound that neutralizes both acids and bases when added to a solution is referred to as a buffer. This is all tied together by the process of titration, which determines the concentration in a solution by adding to it a substance of known concentration in specific amounts. Before testing this experiment, I expected the pH to increase when the acid was added and to decrease when the base was added. First, label 8 test tubes, 2 for every solution, specifically for the solution plus the base and the solution plus the acid. In each test tube, 10mL of each solution should then be added. Next, select and measure the pH of one solution to be tested, record the solution and the pH of that solution in the 0 column in Table 1 found on page 51. By doing this, it will show the initial pH before any acid or base has been added into the solution. Followed by that, add 5 drops of .1 M HCl into the tube, mix, and record the new pH in the acid row found on Table 1. After that continue adding 5 drops at a time until 30 drops total have been added, make sure to record the pH in-between every 5 drops. Once 30 drops have been reached, quit adding and record the final pH. Using the other test tube of the same solution, again, measure the initial pH and repeat the same procedure except adding .1 M NaOH, followed by recording the data in the base row in

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