Water Quality Analyzers Part B Flashcards
A buffer solution is a mixture of 2 substances dissolved in water that resist changes in _______.
pH
Mixtures of weak ________ and their salts make up acidic buffer solutions.
acids
What is the pH value of the buffer solution that determines the pH zero cell offset
7
What are the 3 parts of a pH sensor?
1) a reference electrode
2) a glass pH measurement electrode
3) a temperature sensor
What are the three problems that can occur with reference electrode junctions?
1) The unction may become blocked
2) Chemicals from the test liquid can enter and contaminate the reference electrode solution
3) The porous membrane of the reference junction acquires salt crystals through evaporation which degrades
___________ reference electrodes use 2 junctions
Double junction
Normal glass pH sensors give false low pH readings in solutions containing high concentrations of sodium ions. What is this type of error called?
Sodium ion error
The rate of pH change when adding a base to neutralize the acid is ___________ near the end point.
rapid
What does ORP stand for?
Oxidation Reduction Potential
A specific ion electrode uses a __________ at the bottom of the electrode to exchange specific ions with the liquid
Membrane
___________ metals such as platinum make up ORP electrodes.
Non-reactive
What types of measurements require temperature compensation?
pH and specific ion
The reducing and oxidizing agents in the process liquid affect ___________ measurements
ORP
All substances dissociate into ions (T/F)
False as organic compounds dissolve in water but do not form ions
What 3 factors that affect electron flow resistance i metals?
1) Length of material
2) Metal type
3) Cross section area
