PH test reagent question - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-13-2013, 12:25 AM Thread Starter
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PH test reagent question

I got my drop checker today. Added 1ml of 4dKH water, and a few drops of PH test reagent. It stayed the same color as the reagent, yellow-orange. I have been told it should be blue If I use aquarium water, and the reagent that came with the checker, it goes blue, but don't change when placed in the tank. If I use the reagent that came with the checker, and 4dKH water it stays orange-yellow, same color as the test solution. I am pretty confused. Any input would be appreciated.
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post #2 of 10 (permalink) Old 03-13-2013, 12:49 AM
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I got my drop checker today. Added 1ml of 4dKH water, and a few drops of PH test reagent. It stayed the same color as the reagent, yellow-orange. I have been told it should be blue If I use aquarium water, and the reagent that came with the checker, it goes blue, but don't change when placed in the tank. If I use the reagent that came with the checker, and 4dKH water it stays orange-yellow, same color as the test solution. I am pretty confused. Any input would be appreciated.
When you add the pH Test reagent to the 4 dKH water, it should turn blue. That means your 4 dKH water is suspect or your ph reagent is bad. Where did you get the two reagents?

If you play with chemicals you should know some chemisty.
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post #3 of 10 (permalink) Old 03-13-2013, 01:38 AM Thread Starter
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The 4dKH water is DI purified drinking water, that tested out at exactly 4dKH The PH test reagent if from my API master test kit. I do have a Tetra ph test kit I could try. The Red Sea drop checker I bought, says to use 1ml of aquarium water, and two drops of test reagent. The reagent in the drop checker package, and the ph test reagent from the API test kit are exactly the same color
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post #4 of 10 (permalink) Old 03-13-2013, 02:07 AM
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Quote:
Originally Posted by foster View Post
The 4dKH water is DI purified drinking water, that tested out at exactly 4dKH The PH test reagent if from my API master test kit. I do have a Tetra ph test kit I could try. The Red Sea drop checker I bought, says to use 1ml of aquarium water, and two drops of test reagent. The reagent in the drop checker package, and the ph test reagent from the API test kit are exactly the same color
4 dkH water has to be made with sodium bicarbonate in distilled water.

DI water should not measure 4 dkH in the first place, and you should not be using it in your drop checker.

The pH test reagent you are using is fine (bromothymol blue).

Ignore the Red Sea drop checker instructions. You cannot use aquarium/tap/DI/RO/distilled water in the drop checker. You must use a solution with a known carbonate hardness, where the only contributing ion to carbonate hardness is the bicarbonate anion.

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post #5 of 10 (permalink) Old 03-13-2013, 09:48 AM Thread Starter
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This whole thing is very strange. If I put the 4dKh water in one of the test viles, and add PH teset reagent it will turn blue. If I put the water in the drop checker, and add reagent it stays orange. Looking at the drop checker in the tank this morning, the test solution is green. So it changed overnight. I am baffled completely. What should be different from a test vile, to the drop checker resevoir? The only difference is, one is glass, and one is plastic
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post #6 of 10 (permalink) Old 03-13-2013, 11:26 PM Thread Starter
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I picked up some distilled water tonight, mix sodium bicarb in it until I had exactly 4dKH of hardness. Took a small sample of the test water, added ph test reagent, and it turned blue with the first drop. I think I have it now. The problem must have been the purified drinking water. Thanks to all who helped me with this!!
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post #7 of 10 (permalink) Old 03-13-2013, 11:37 PM
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Make sure you're not using a 'high range' pH test solution, for 7+ pH results.
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post #8 of 10 (permalink) Old 03-14-2013, 12:28 AM Thread Starter
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Using the general range PH test kit. I believe the high range is a red color.
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post #9 of 10 (permalink) Old 03-14-2013, 01:00 AM
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Using the general range PH test kit. I believe the high range is a red color.
You're using the wrong pH solution. You need to use bromothymol blue. It shows a deep blue at high pH (7.8), and yellow at low pH (6.0).
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post #10 of 10 (permalink) Old 03-14-2013, 01:42 AM
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Using the general range PH test kit. I believe the high range is a red color.
This does not sound like the general range pH test kit...

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