ANALYSISLAB | ASSAY OF SODIUM BICARBONATE

• Acidimetry 


  Used to determine the concentration of base substances using standard acid. (Known volume of base is the analyte.)
• Alkalimetry


  determines the concentration of acids. (known volume of acid is analyte.)
• Assay 


  Used to determine the presence of a particular substance and its concentration.
• Assay of Sodium Bicarbonate


  Analyte - Sodium Bicarbonate

  Titrant - 1N Sulfuric Acid

  Indicator - Methyl Orange
• Sodium Bicarbonate


  -NaHCO3

  -Weak base

  -Analyte
• 1 Normal Sulfuric Acid


  -H2SO4

  -Strong Acid

  -Titrant
• Methyl Orange

  -Indicator
• Type of Titration Used

  -Direct Acidimetry (Results seen immediately, base is the analyte)
• Indicators


  Determines Change in pH, Hydrogen ions, and endpoint.
• Strong Acid + Strong Base

  Methyl orange, Methyl Red, Phenolphthalein
• Weak Acid (Analyte) + Strong Base (Titrant)

  Alkalimetry = Phenolphthalein
• Weak base + Strong Acid

  Acidimetry ; Methyl Red
• Volumetric Analysis


  Finds endpoint and stoichiometric point
• Assay


  Finds % Purity
• Complete Chemical Equation


  2NaHCO3 + H2SO4 -> Na2SO4+H2O
• Why methyl orange?

  Other indicators are affected by carbonic acid and will change before endpoint.
• Carbonic Acid

  • H2CO3
  • Caused by HCO2 + H2O
• Sodium Carbonate (Baking Soda)


  Systemic alkalizer, antacid