postlab10 - Laura Lanier Lab L2 Exp 10 P a g e | 1...

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Unformatted text preview: Laura Lanier Lab L2 Exp 10 P a g e | 1 Data/Results Pa r t A mL NaOH added pH mL NaOH added pH mL NaOH added pH mL NaOH added pH 0.00 1.54 9.00 1.84 24.00 5.74 41.00 7.84 0.50 1.44 9.50 1.88 24.50 5.88 42.00 8.02 1.00 1.54 10.00 1.94 25.00 6.02 42.50 8.18 1.50 1.54 11.00 2.02 26.00 6.24 43.00 8.34 2.00 1.52 12.00 2.08 27.00 6.36 43.25 8.42 2.50 1.46 13.00 2.16 28.00 6.52 43.50 8.58 3.00 1.60 14.00 2.24 29.00 6.58 43.75 8.82 3.50 1.68 15.00 2.28 30.00 6.72 44.00 9.06 4.00 1.64 16.00 2.44 31.00 6.82 44.25 9.94 4.50 1.66 17.00 2.50 32.50 6.92 44.50 10.24 5.00 1.70 18.00 2.64 34.00 7.04 44.75 10.42 5.50 1.74 19.00 2.86 35.00 7.16 45.00 10.64 6.00 1.70 20.00 3.08 36.00 7.22 45.50 10.64 6.50 1.72 21.00 3.20 37.00 7.36 46.00 11.06 7.00 1.74 21.50 3.44 38.00 7.46 46.25 11.14 7.50 1.78 22.00 3.76 39.00 7.56 46.50 11.22 8.00 1.82 23.00 5.18 40.00 8.26 46.75 11.26 8.50 1.80 23.50 5.54 40.50 7.70 47.00 11.28 Laura Lanier Lab L2 Exp 10 P a g e | 2 Equivalence Point (mL) pK a K a 1 23.00 2.08 8.32E- 03 2 44.25 7.04 9.12E-08 3 46.00 10.64 2.29E-11 Molarity of Acid (M) Id of Acid 0.115 Phosphoric acid Pa r t B Making the Buffer Phosphoric acid added 100 mL Sodium Phosphate added 1.640 Addition Starting pH Ending pH Observations NaOH 2.26 2.36 Fluctuated a little but not much HCl 2.3 2.17 Fluctuated a little but never much or below 2.05 Laura Lanier Lab L2 Exp 10 P a g e | 3 Distilled Water 2.26 2.3 pH didnt change much Buffer Capacity Starting pH 2.28 Change in pH 2.52 Volume NaOH added (mL) 2.5 Molarity of NaOH (M) 1.0 Moles NaOH (mol) .0025 Buffer Capacity 0.0009 9 Reactions Reaction NaOH added NaOH (s) Na + (aq) + OH- (aq) H 3 PO 4 (aq) + OH- (aq) H 2 O (l) + H 2 PO 4- (aq) HCl added HCl (s) H + (aq) + Cl- (aq) H 2 PO 4- (aq) + H + (aq) H 3 PO 4 (aq) Discussion/Conclusion Pa r t A Laura Lanier Lab L2 Exp 10 P a g e | 4 Titration is a process used to identify an unknown acid and its molarity; adding bases and...
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postlab10 - Laura Lanier Lab L2 Exp 10 P a g e | 1...

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