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Old 01-04-2009, 11:26 PM
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Default pH directions for Tetratest Laborett

I have come upon a fairly new Larorett "Water Test Set (with a freshwater angelfish and mclownfist in the front - blue box with a black title bar). It tests pH, KH, GH, NO2, NH3/NH4 and has the square 15ml test tubes. Anyway, I have all the color cards, but no directions for the saltwater pH test, so.......

Does anyone know how much sample water (5ml?) and how many drops of saltwater pH test solution for this test???

Thank much!

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Old 01-05-2009, 12:07 AM
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It's probably 5 ml of water and perhaps 5 drops of dye. The volume of water and dye isn't critical here, as long as you're not going nuts with the dye (e.g., 5 ml of water, and 5 ml of dye would not be a good idea ). The way that colorimetric pH indicators work is by changing color slightly depending on the pH of the solution. The color that develops is independent of dye concentration over a reasonable range. More or less dye just makes the same water more or less transluscent, but shouldn't change that color. However, the dyes themselves have a very modest effect on pH. Hence, if you are using as much dye as water (or just way too much dye) you'll slightly change the pH of your sample. 5 ml of sample and 5 drops of dye should be fine.
Old 01-05-2009, 07:50 PM
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Default Tetratest Laborett pH

Thanks MC. 5 drops on 5ml seem to verify my pH meter. If anyone has the actual kit to check, that would be great.

blue, saltwater

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