L1 /
3
CH3041
ALKALINITY I
• ANC is synonymous with Alkalinity.
• There are various
types of alkalinity.
• The determination
of the Total Alkalinity of a water
sample involves titration with HCl to the methyl orange (pH4.3) end point:
- all bases are titrated out at this point.
- all bases are titrated out at this point.
• The determination
of just the Caustic Alkalinity involves
titration to pH 10.7 using a pH
probe: mainly [OH-] is found.
• Finding the Carbonate Alkalinity (phenolphthalein
alkalinity) involves titration to the phenolphthalein (8.2) end pt: mostly [CO32-] has been
determined as most natural waters
have pH <10.7.
