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# 7.03 pH Lab

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## alyssa smith

on 25 June 2014

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#### Transcript of 7.03 pH Lab

pH Indicator : Part 1
7.03 pH Lab

PART 1: TRIAL 1: TRIAL 2: TRIAL 3:
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Initial volume of Na OH: 50 50 50
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Volume of HCI: 25 30 35
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Volume of Na OH (end): 23 26 29
Calculations
1) 50 mL NaOH added to the flask (23 mL left). Overall, 25 mL of NaOH was added too and 26 mL left.

2) pH=-log([H+])
50=-log([H+])
[H+]=10^(-0.50)
[H+]=.5
Conclusion
1)The HCl is the acid and the NaOH id the base. When you increase the amount you will find that the reaction becomes less acidic. Which means it rises on the graph. It neutralizes when the pH level is 25. And increases as you add NaOH.

2) It increases the rate of the reaction.
pH Meter : Part Two
TRIAL 1: TRIAL 2: TRIAL 3:
______________________________________________________________________________
Initial volume of Na OH: 50 50 50
______________________________________________________________________________
Volume of HCI: 20 20 20
______________________________________________________________________________
pH when 0 ml Na OH has been added:
0.70 0.70 0.70
_________________________ _____________________________________________________
Volume of Na OH (end): 7.00 7.00 7.00
______________________________________________________________________________
pH of solution each time an increment of 5 ml of Na OH is added. (5,10,15,20,25)
0.96,1.3,2.15,7.00,12.7 0.96,1.3,2.15,7.00,12.7 0.96,1.3,2.15,7.00,12.7
______________________________________________________________________________
pH of solution each time an increment of 5 ml of Na OH is added.(30,35,40,45,50) 12.85,12.94,13,13.05,13.08 12.85,12.94,13,13.05,13.08 12.85,12.94,13,13.05,13.08
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