What is a Potentiometric Titration? by k3FrCv

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									        What is a Potentiometric
               Titration?
• Potentiometric titration- uses a ___________ to determine
  ____________
• Potentiometer-measures _________________________
• pH meter- a type of _____________ – measures ________
______________ and gives us_____________
• Our pH meters have _____________ that consist of
  ___________________________ and _______________
  to allow exchange of ions to be detected
• You must first _____________________ the pH meter
  (just as we did with the spec 20s last semester) to let it
  know what potential changes are equivalent to particular
  pHs. You should always calibrate instruments _________
_________________________________________________
http://www.monashscientific.com.au/pHCompoundElectrodePic.htm
            Why Potentiometric?
• ADVANTAGES:
  – If you have multiple unknowns with different ____________________
    and want to identify each
  – ______ solutions that would interfere with detection of colored indicators
  – ______ solutions that would interfere with detection of colored indicators
  – Better ____________________
  – You can graph to determine endpoint instead of relying on visual
    detection
• DISADVANTAGES:
  – _______________
  – $- pH meters much more expensive than colored indicators
  – Cannot detect when you are _________________________________
       Standardization of HCl
• Primary vs. Secondary Standards
  – 1° = a reference standard of known ________
  __________ You can know EXACTLY how
    many _________________ you have
  – 2° = ___________________________. You
    use the _____ standard to determine
    concentration in order to use this standard to
    determine amount of something else.
  Standardization of HCl cont’d.
• Calculations
  Known:

  Want:
               Unknown
• Goal:
  ________________________________________
  __
• Known:

								
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