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Acid base titration

  1. 1. ACID BASE TITRATION BY: HIMANSHU RAJPUROHIT DETACHMENT OF PH. ANALYSIS
  2. 2. INTRODUCTION • Acid base titration is base upon the neutrailization reaction between acid and base. Therefore it is also called neutralization titration In acid base titration, the standard solution having know concentration of acid is titrated against the unknows concentration of base or vice versa. • In neutrailization reaction salt and water form • NaOH + HCL NaCL + H2O
  3. 3. CONCEPT OF ACID BASE • 1. Arrhenius acid base theory • 2. Bronsted-Lowry proton theory • 3. Lewis electron theory
  4. 4. 1. ARRHENIUS ACID BASE THEORY • According to Arrhenius concept acid is substance which gives hydrogen (H+)ion in water. • HCL H+ + Cl- • According to Arrhenius concept base is substance which gives hydroxyl (OH) ion in water. • NaOH Na+ + OH -
  5. 5. 2.BRONSTED-LOWRY PROTON THEORY • According to Bronsted lowry concept acid is a chemical which gives proton (H+)in solvent. • HCL H+ + Cl- • According to Bronsted lowry concept base is a chemical which accept proton (H+)in solvent
  6. 6. 3. LEWIS ELECTRON THEORY • According to lewis concept acid is a substance which accept electron pair to form a coordination bond. • Eg. H+, NH4+ • According to lewis concept base is a substance which give electron pair to form a coordination bond. • Eg. NH3, OH-
  7. 7. THEORIES OF ACID BASE INDICATOR • Acid base indicator is a chemical which determine the end point in neutralization titration by changing color according to pH of titration solution. • 1. Ostwald theory • 2. Resonance theory
  8. 8. 1. OSTWALD THEORY • Acid base indicator is either a weak acid or a weak base having different color in ionized and unionized forms. • Phenolphthalein is a weak acid it show pink color in basic medium and is colorless in acidic medium. • Methyl orange is a weak base is pink color in acidic medium and yellowish color orange in basic medium.
  9. 9. 2. RESONANCE THEORY • Acid base indicator is organic compound and exists in 2 tautomeric forms • 1. Benzenoid • 2. Quinonoid • Eg Phenolphthalein in acid solution: Quinonoid form change into benzenoid form to show the lighter of color of the indicator (colourless) • Phenolphthalein in base solution benzenoid form changes into quinonoid form to show the darker colour of indicator (pink)
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Acid base titration

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