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Titration of Strong Monoprotic Acid and Base

Titration of Strong Monoprotic Acid and Base. Polyprotic Acids. How to solve K a expression for Polyprotic Acids?. Polyprotic Acids/Bases. polyprotic acid can donate more than one proton polyprotic base can accept more than one proton. Ba(OH) 2. H 2 SO 4. Bethany Storro.

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Titration of Strong Monoprotic Acid and Base

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  1. Titration of Strong Monoprotic Acid and Base

  2. Polyprotic Acids How to solve Ka expression for Polyprotic Acids?

  3. Polyprotic Acids/Bases • polyproticacid can donate more than one proton • polyproticbase can accept more than one proton Ba(OH)2 H2SO4 Bethany Storro

  4. Equilibrium Expressions for Polyprotics • Ka1= ionization constant for the first hydrogen atom H2S(aq) + H2O(l)   H3O+(aq) + HS-(aq) • Ka2= ionization constant for the second hydrogen atom HS-(aq) + H2O(l)   H3O+(aq) + S2-(aq)

  5. Ka1 compared to Ka2 • If the difference between the Ka1 and the Ka2 values is 103 or more, the pH generally depends only on the first dissociation.

  6. H2SO4 • Unique among common acids • STRONG in is first dissociation step ( ≥1.0 M) • WEAK acid in the second step (use quadratic)

  7. Typical Titration with Weak Monoprotic Acids

  8. Do the Structure, Initial Concentration of A/B influence pH ? • Investigate your designated question • Design a series of investigations involving titrations • Analyze titration curves • Pool data/Compare data with others • Answer primary question of lab

  9. Available Materials • 0.2 M HCl • 0.1 M H2SO4 • 0.05 M HNO3 • 0.1 M HC2H3O2 • 0.2 M NH3 • 0.1 M NaOH • 0.1 M Ca(OH)2 • Stir rod • 2 x 100 mL grad. cylinders • 2 x 250 flasks • Ring • pH strips, probe • 2 x 50 mL burets + clamp

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