Experiment 18 Report sh Potentiometric Analy Desk No A. Molar Concentration ofa

Question

Experiment 18 Report sh Potentiometric Analy Desk No A. Molar Concentration ofa Weak Acid Solution Trial 2 O. 1018H 25 mL Trial I Trial3 Trial 3 Molar concentration of NaOH (movt 25 mL- L. 2. Volome of weak asid (mb) mL 3,Barer reading of NaOH, minial (mL) 4. Buct rcading NaH al sichiometrie point, & Volume of NaOifl dispensed (ml) Instructor's agprval of pH vs. Yu-graph 7. Moles of NaOH to stoichiometric point (mot) & Moles of scid (mo) . Molar concentration of acid (molL.) 10. Average molar concentration of acid (molL) B. Molar Mass and the ph, of a Solid Weak Acid Sample no. Moeoprotic or diprotic acid? Suggested mass Trial 2 Laborato Trial I Triel 3 1. Thep L Mass of dy, solid acid 2 Molar concentration of NaOH (molL) J. Buret rcadng of Na0H, initial m) 2 The p Buret reading NaOH at stoichiometric point, nal (ml) 5. Volume of NaOH dispensed (mL) Instructor's approval of pH versus Vam graph 7, Moles of NaOH to stoichiometric poent (mol) & Moles of acid (mo 9, Molar mass of acid Opiuol) 10. Average molar mass of acid (g/mol) 11. Volume of NaOH halfway to stoichiometrie L Part point (mL.) 12. pk,j of weak acid (from graph) 13. Average pk Show calculations for Trial I on the next page. Experiment 18 229 230 0 130

Explanation / Answer

The equivalence point, or stoichiometric point is the point at which chemically equivalent quantities of acid and base have been mixed. In other words, the moles of acid are equivalent to the moles of base.

You are doing potentiometric titration by measuring PH so equivalance point or stoichiometric point for acid base titration is PH=7. At PH=7 the moles of acid are equivalent to the moles of base.

You can easily find it from graph if you draw graph : volume of NaOH added Vs PH (obtained data page2 and 3)

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