Do not eat or drink in the lab sodium hydroxide is

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Always wear goggles and an apron in the lab. Do not eat or drink in the lab. Sodium hydroxide is caustic. Avoid spilling the solution on your skin or clothing. Westminster College SIM PH8-1
Determination of Phosphoric Acid Content in Soft Drinks PROCEDURE1.Use a graduated cylinder to measure out 40 mL of a decarbonated cola soft drink and 60 mL of distilled water into a 250-mL beaker 2.Place the beaker on a magnetic stirrer and add a stirring bar. If no magnetic stirrer is available, you need to stir with a stirring rod during the titration. 3. Plug the pH Sensor into Channel 1 of the LabPro interface. Use the link cable to connect the TI Graphing Calculator to the interface. Firmly press in the cable ends. 4. Use a utility clamp to suspend the pH Sensor on a ring stand as shown in Figure 1. Position the pH Sensor in the beverage solution and adjust its position so that it is not struck by the stirring bar. 5. Obtain a 50-mL buret and rinse the buret with a few mL of the 0.050 M NaOH solution. Dispose of the rinse solution as directed by your teacher. Use a utility clamp to attach the buret to the ring stand as shown in Figure 1. Fill the buret a little above the 0.00-mL level of the buret with 0.050 M NaOH solution. Drain a small amount of NaOH solution so it fills the buret tip andleaves the NaOH at the 0.00-mL level of the buret. Record the precise concentration of the NaOH solution in your data table. Figure 1 6. Turn on the calculator and start the DATAMATEprogram. Press CLEARto reset the program. 7. Set up the calculator and interface for the pH Sensor.

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