Question

PROCEDURES and DATA COLLECTION: PART A. Observe the changes in pH of both buffered and non-bsuffered selutions digital pH meters if working pH meters are available using universal pH paper and/or 1. Obtain a package of universal pH paper with a color chart and a digital pH meter if they are available. 2. Obtain 6 medium sized test tubes and label them 1-6 (confirm that the pH meter probe will fit inside) THE TEST TUBES are clean, with clean and free of soap residue . MAKE SURE 2 soop residue. They do not have to be dried before using, but they absolutely must be 3. Starting with test tube 1 and using one test tube at a time, work across the data table. For example, in Column 2 record the pH of the water in test tube 1, then add 3 drops of 0.1M NaOH (sodium hydroxide, a base) to test tube 1 Shake well. In Column 4, record the new pH. If you are using a digital pH meter, round to the first decimal place; if you are using pH paper, report a range if necessary. MAKE SURE YOU RINSE THE TIP OF THE PH METER WELL BEFORE NSERTING IT INTO ANOTHER TEST TUBEI Column 4: pH gfter oddition of acid HCIor base NoOH (if using paper, give the color and Column 1: Column 2 (pH: if using paper, give the color and range ofpH) Column 3 Test tube 1: approximately 5 mL of tap water Add 3 drops of 0.1M NaOH (sodium hydroxide, a base) Test tube 2: approximately 5 ml of tap water Add 3 drops of 0.1 M HC (hydrochloric acid) Test tube 3: approximately 5 mL of pH 4 buffer Add 3 drops of 0.1M NaOH (sodium hydroxide, a base) Add 3 drops of 0.1 M HC (hydrochloric acid) Test tube 4: approximately 5 mL of pH 4 buffer Test tube 5: approximately 5 ml of pH 10 buffer Add 3 drops of 0.1M NaOH (sodium hydroxide, a base) Test tube 6 opproximotely 5 ml of pH 10 buffer Add 3 drops of 0.1 M HCI (hydrochloric acid)

Answer 1