Hopefully someone could answer this for me. I’m not receiving expected results with a sodium bicarbonate/water solution mixed to a dKH of 25.
Recently I started measuring alkalinity using the method of titration described here. Wanted to confirm results against a standard solution.
I’m using a laboratory grade scale, metered pipette, magnetic stir, calibrate pH probe with each measurement, cleaning equipment with the deionized water. Weighing acid solution and sample water.
Here is what I did. Perhaps someone can enlighten me to the issue.
Mixed solution in 5 gallon hdpe container.
8,817.57 grams of RoDi water
6.61 grams sodium bicarbonate
measured out 1000ml/1000 grams of sample solution.
Started titration expecting to add 89.28ml or 87.53 grams of 0.1 N hydrochloric acid. Added 80.80 grams of hydrochloric acid and pH of 4.39.
The only thing i can think is my conversion for volume to weight of .1N hydrochloride acid is incorrect.
Is titration accuracy only limited by equipment accuracy?
Recently I started measuring alkalinity using the method of titration described here. Wanted to confirm results against a standard solution.
A DIY Alkalinity Test: By Randy Holmes-Farley - REEFEDITION
Alkalinity is one of the most important measurements that a reef aquarist can make. It can become rapidly depleted in many aquaria, requiring frequent measurement in order to maintain stable levels.
www.reefedition.com
I’m using a laboratory grade scale, metered pipette, magnetic stir, calibrate pH probe with each measurement, cleaning equipment with the deionized water. Weighing acid solution and sample water.
Here is what I did. Perhaps someone can enlighten me to the issue.
Mixed solution in 5 gallon hdpe container.
8,817.57 grams of RoDi water
6.61 grams sodium bicarbonate
measured out 1000ml/1000 grams of sample solution.
Started titration expecting to add 89.28ml or 87.53 grams of 0.1 N hydrochloric acid. Added 80.80 grams of hydrochloric acid and pH of 4.39.
The only thing i can think is my conversion for volume to weight of .1N hydrochloride acid is incorrect.
Is titration accuracy only limited by equipment accuracy?