Experiment stuff

• Describe the function of the plastic covering of the probe.

  The plastic covering protects the sides and components of the pH probe from damage.
• Describe the function of the glass bulb of the probe.


  It's permeable to hydrogen ions and therefore must be exposed to the solution when measuring pH.
• Why the function of referencing electrolyte inside the probe?


  It serves to close the electrical circuit in the electrode
• What are the properties of a referencing electrolyte which benefits the pH meter.


  Good electrical conductivity and is chemically neutral.
• What's the referencing junction in the probe? 


  Separates the reference electrolyte (an internal solution) from the external environment.
• What parts of the probes must be submerged when the pH probe is immersed into solution?


  The glass bulb and the reference junction
• Why is it important for the pH probe to not touch the bottom of the beaker?


  The bulb glass is at risk of getting cracks, which can stop the probe from functioning
• Draw and label a pH probe


  Example:

  
• At what level does the probe need to be immersed in the solution?


  Until the meniscus of the solution being measured is above the reference junction.
• What's the difference between reference half-cell and sample half-cell?


  Reference half-cell produces a constant voltage from the unchanging reference electrolyte (sits in the reference electrolyte)

  Sample half-cell produces varying voltage depend on the pH of the immersed solution (sits in the glass bulb)