- Rinse the test tube with the water to be tested and fill to the 5 ml mark using injector.
- Add 3 drops P (FF, phenolphthalein) Indicator and shake. The solution must turn pink, otherwise determine M value on step 4 th.
- Add alkalinity Titration Solution drop by drop till the pink color turns to colorless. Titration is completed when it turns to colorless. Reported P alkalinity is total drops of titration solutions.
1 drop TITRATION SOL = 50 ppm Phenol (p) Alkalinity.
- Add 3 drops MR indicator to the same test tube. The solution must turn green.
- Add TITRATION SOLUTION drop by drop till it turns green to grey-red, count the titration solutions drops while the test solutions color changes green to grey-red. Reported M Alkalinity is total drops of these steps.
1 drop TITRATION SOL = 50 ppm Total (M) Alkalinity
Total Alkalinity= P alkalinity+M alkalinity
1 drop TITRATION SOL = 50 ppm Total (M) Alkalinity
Total Alkalinity= P alkalinity+M alkalinity
| VALUES | HYDROXIDES | CARBONATES | BICARBONATES |
| P=0 | – | – | m |
| P=m | m | – | |
| 2p=m | – | m | – |
| 2p>m | 2p-m | 2(m-p) | – |
| 2p< m | – | 2p | m-2p |
Note :
p = 0 alkalinity is caused by bicarbonate.
p = m alkalinity is caused by hydroxide.
2p = m alkalinity is caused by carbonate.
2p › m alkalinity is caused by carbonate and hydroxide.
2p ‹ m alkalinity is caused by carbonate and bicarbonate.
