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Hydrochloric acid (HCl) solutions as a secondary standard

• A 0.1 M HCl (hydrochloric acid) solution is used as a standard to standardise or determine the strength of a approximate 0.1 M sodium hydroxide (NaOH) solution
  
  
• A HCl solution is used as it can be prepared accurately and is quite stable.
  
  
• Because of this stability it is called a secondary standard.
  
  Even more accurate and stable standards are called primary standards.