A select setup from the main screen b if ch 1

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a.Select SETUPfrom the main screen. b.If CH 1 displays PH, proceed directly to Step 8. If it does not, continue with this step to set up your sensor manually. c.Press ENTERto select CH 1. d.Select PHfrom the SELECT SENSORmenu. Westminster College SIM PH8-2
Determination of Phosphoric Acid Content in Soft Drinks 8. Set up the data-collection mode. a.To select MODE, press once and press ENTERb.Select EVENTS WITH ENTRYfrom the SELECT MODEmenu. c.Select OKto return to the main screen. 9. You are now ready to perform the titration. This process goes faster if one person manipulates and reads the buret while another person operates the calculator and enters volumes. a.Select STARTto begin data collection. b.Before you have added any NaOH solution, press ENTERand type in “0” as the buret volume, in mL. Press ENTERto save the first data pair for this experiment. c.Add 0.5 mL of NaOH solution. When the pH stabilizes, press ENTERand enter the current buret reading. You have now saved the second data pair for the experiment. d.Continue to add 0.5-mL increments, entering the buret level after each increment. When the pH has leveled off (near pH 10), press STOto end data collection. 10. Examine the data on the displayed graph to find the equivalence point—that is, the 0.5-mL volume increment that resulted in the largest increase in pH. As you move the cursor right or left on the displayed graph, the volume (X) and pH (Y) values of each data point are displayed below the graph. Go to the region of the graph with the large increase in pH. Find the NaOH volume (in mL) just beforethis jump. .

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