Meeting 5. Acid-Base Titration

1. Meeting 5.Acid-Base Titration

2. - What is titration?- Why acid-base titration is called neutralization titration?- what is acidimetric titration?- what is alkalimetric titration?- What is the principle of reaction?

4. Principle reaction: • Involve the change of [H+] and [OH-] • Involve the change of pH. • What is pH? • What is pH of 100 mLHCl 0,1 M? • What is pH of 100 mLNaOH 0,1 M? • Is pH of 100 mLHCl 0,1 M similar with pH of 100 mL CH3COOH 0,1 M

5. Curve of Acid-base Titration HCl + NaOH  NaCl + H2O Reaksi ionnya : H+ + OH- H2O Strong acid + Strong Base Example: HCl + NaOH  NaCl + H2O Ionic reaction: H+ + OH- H2O

6. What is the pH of titration? • 10 mLHCl 0,1 M + 0 mLNaOH ? • 10 mLHCl 0,1 M + 5 mLNaOH 0,1 M? • 10 mLHCl 0,1 M + 10 mLNaOH 0,1 M? • 10 mLHCl 0,1 M + 20 mLNaOH 0,1 M?

7. 10 mLHCl 0,1 M + 0 mL NH4OH ? • 10 mLHCl 0,1 M + 5 mL NH4OH 0,1 M? • 10 mLHCl 0,1 M + 10 mL NH4OH 0,1 M? • 10 mLHCl 0,1 M + 20 mL NH4OH 0,1 M? How about this?

8. Indicator in Acid-base titration • The color change should be as near as possible to equivalent point • In Fact: it is very difficult end point of titration • End Point ~ Equivalent Point • How can we choose the indicator?

9. pH range of some indicators

10. Contoh Perubahan WarnaIndikator Asam-basa Example:The color change of Acid-Base Indicator

11. Universal Indicator