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Standardisation of sodium hydroxide solutions (procedure)

Note: Only an approximate concentration of sodium hydroxide (NaOH) can be prepared which then has to be standardised.


• To determine the concentration of, or to standardise solutions of sodium hydroxide (NaOH) you need to just react all the NaOH present with a compound such as hydrochloric acid (HCl). (see equation)
  
  
• To standardise an approx. 0.1M NaOH solution we use an accurately known concentration of an HCl soln. close to 0.1M
  
  
• You can then calculate the amount of NaOH originally present, from the amount of HCl (hydrochloric acid) used to neutralize or react with the NaOH. (see procedure)
  
  
• Note: A 0.01M NaOH solution is prepared from a standardised 0.1M NaOH solution by dilution, utilising volumetric flask (see NaOH solution preparation)