Q Neutralization Curves: Potentiometric Methods

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Presentation transcript:

Q Neutralization Curves: Potentiometric Methods Dr. Prem D. Sattsangi Copyright © 2009

During a titration experiment, we added 25mL of water to 25 During a titration experiment, we added 25mL of water to 25.00mL of AcOH(aq) sample. The first pH reading was 3.75. (a) what is the [H3O+] of the diluted solution? (b) what would be the [H3O+] before dilution? (c)Calculate the Ka of acetic acid using the data, if [AcOH] is 0.0628 M Ka = [H3O+] x [AcO-] [AcOH]

Neutralization Reactions NaOH (aq) + AcOH (aq)  NaOAc (aq) + H2O For the neutralization of 25.00mL AcOH, 5.5mL of 0.113M NaOH are used. Calculate: (a) moles of NaOH used: (b) moles of AcOH: (c) Molarity of AcOH:

Ionization of H3PO4 Phosphoric acid is a triprotic acid which ionizes in the following three steps (1) H3PO4  H2PO4- + H+ (2) H2PO4-  HPO42- + H+ (3) HPO4-  PO43- + H+ Loss of the proton occurs one at a time.

The Calomel Electrode