Procedure
1) Weigh out 4.2g of NaOH and dissolve it in 50 mL of water in a 250 mL Erlenmeyer flask.
2) Transfer the solution into a 1-L volumetric flask, and fill the flask to the 1000 mL mark with deionized water. Put the stopper in the flask, invert the flask and shake gently.
3) Transfer the solution into a 1-L plastic bottle, and label the bottle.
4) Start a new experiment on the data collection system.
5) Connect a pH sensor and the Rotary Motion sensor to the data collection system.
6) Using DataStudio make a calculated data set for Volume: V=670*x.
7) Also, in DataStudio create a calculated dataset for the first derivative of the pH vs. Volume. Use the pH measurement for x. The equation is:
dpH= derivative (2,x)
8) Display the pH on the y axis and the Volume on the x axis.
9) Set up the titrator pump, and rinse the syringe on the titrator pump.
10) Then, set up the titrator accessory and calibrate the pH sensor. Then, add the micro stir bar to the end of the pH sensor.
11) Set up the titrant container and replace the cap on the bottle, but make sure that it is not air tight.
12) Load the syringe on the pump with the titrant solution, and prime the pump on the Titrator.
13) Measure 0.200g of KHP and wash the KHP sample from the weighing dish with about 50 mL of water into a 180mL titration jar.
14) Add deionized water to the solution until the tip of the pH sensor is covered with solution. And then turn on the magnetic stirrer at a steady rate.
Data Collection:
1)Start recording data, and press the run button on the Titrator to start the titration.
2)Continue the titration past the equivalence point until the pH curve flattens. Then stop recording data.
3)Repeat the titration two more times, and record the masses of the samples in Table 2.
4)Once the concentration of the NaOH has been determined, label it and save it for the "Acid-Base Titration."
5) Save the experiment and clean up according to teacher's instructions. Print the graph.