Put 10 mL of water in an empty large test tube. Label it as water. Measure and record the pH of the water. Remove the pH meter, then add 2 drops of 0.500 M NaOH to the water and swirl the test tube gently (while the pH meter is removed from the test tube). Submerge the end of the pH meter in the solution to measure and record the pH. Add an additional 2 drops of 0.500 M NaOH to the test tube (swirl gently after removing the pH meter), then measure and record pH. Repeat step 8 until a total of 12 drops are added. Rinse the pH probe with DI water and dab gently with a KimWipe. Obtain one of the test tubes from Part 1 (acetic acid / acetate buffer). Measure and record the pH. Repeat steps 3-7 with the acetic acid / acetate buffer. Obtain one of the test from Part 2 (ammonia / ammonium buffer). Measure and record the pH. Repeat steps 3-7 with the ammonia / ammonium buffer. Part 5: Clean up Rinse the pH probe with DI water, dab gently with a KimWipe and put it back into the solution it came in. Put all waste into the beaker in the fume hood. Power off the LabQuest and return it to the cabinet in the back of the room. Data Tables:
Put 10 mL of water in an empty large test tube. Label it as water. Measure and record the pH of the water. Remove the pH meter, then add 2 drops of 0.500 M NaOH to the water and swirl the test tube gently (while the pH meter is removed from the test tube). Submerge the end of the pH meter in the solution to measure and record the pH. Add an additional 2 drops of 0.500 M NaOH to the test tube (swirl gently after removing the pH meter), then measure and record pH. Repeat step 8 until a total of 12 drops are added. Rinse the pH probe with DI water and dab gently with a KimWipe. Obtain one of the test tubes from Part 1 (acetic acid / acetate buffer). Measure and record the pH. Repeat steps 3-7 with the acetic acid / acetate buffer. Obtain one of the test from Part 2 (ammonia / ammonium buffer). Measure and record the pH. Repeat steps 3-7 with the ammonia / ammonium buffer. Part 5: Clean up Rinse the pH probe with DI water, dab gently with a KimWipe and put it back into the solution it came in. Put all waste into the beaker in the fume hood. Power off the LabQuest and return it to the cabinet in the back of the room. Data Tables:
Chem121_Lab6_Buffers%20(2).docx