#5 Titration of Diprotic Acid

#5 Titration of Diprotic Acid - Aaron King 660556233...

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Aaron King 660556233 Section 1 Wednesday, March 18, 2008 #5 Titration of a Diprotic Acid 1. The concentration of the sodium hydroxide solution was calculated in the last lab. The following table and calculations were done in “Lab #4 – Weak Acid Strong Base Titration.” mass KHP (g) mol KHP mL NaOH M NaOH Trial 1 0.4087 0.002001 16.48 0.1214 Trial 2 0.4050 0.001983 16.31 0.1216 Trial 3 0.3987 0.001952 16.21 0.1204 0.1211 . . × . × = . 0 4087gKHP16 48mL 1molKHP204 22gKHP 1000mL1L 0 1214M = + + M M1 M2 M33 = . + . + . M 0 1214M 0 1216M 0 1204M3 = . M 0 1211M 4. . × . = . 18 8mL 0 1211molNaOH1000mL 0 00228molNaOH . × = . . . 0 00225molNaOH 1molH2X2molNaOH 0 00114molH2X0 1210gH2X0 00114molH2 = X 106gmolH2X
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King 2 5. Malonic Acid (104g/mol) % = - × % E OBS ACCACC 100 % = / - / / × % E 106g mol 104g mol104g mol 100 % = . % E 1 92 7. 1 st equivalence point=9.2mL half-equivalence point=4.6mL pH=2.9 pKa=2.9 2 nd equivalence point=18.8mL half-equivalence point=14.0mL pH=5.6 pKa=5.6 8. pKa=2.9
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#5 Titration of Diprotic Acid - Aaron King 660556233...

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