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Author: Subject: pH paper: 1 colour vs multicolour?
fusso
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[*] posted on 31-3-2019 at 08:02
pH paper: 1 colour vs multicolour?


I've seen 2 types of pH paper, 1 is the plain yellow coloured strip, another is a few patches on the same strip, and different patches will turn into different colours when dipped into the same solution.
Which is superior?




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SWIM
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[*] posted on 31-3-2019 at 08:26


I've never even seen either of those.

How about pink?
Or blue?
Or that Hydrion wide range multi-color stuff?





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fusso
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[*] posted on 31-3-2019 at 08:38


This is the multicolour I'm talking about :
https://www.ebay.com/itm/100pcs-PH-Indicator-Test-Strips-1-1...




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draculic acid69
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[*] posted on 31-3-2019 at 08:43


Those ones are generally used for swimming pools and stuff.get both for improved accuracy.
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Sulaiman
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[*] posted on 31-3-2019 at 10:03


One difference is that the cheap pH 1-14 papers that I use react to just one drop of sample liquid,
and a small piece can be dropped in a beaker/flask/test tube.




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Ubya
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[*] posted on 31-3-2019 at 12:37


with universal ph paper (the yellow one)you usually add 1 drop of solution to the paper, while the other kind is dipped in the solution.
i don't know which is more accurate (they also sell "universal ph paper" but for narrower ph intervals to be more accurate with your measuring), butin general would be better to bring a drop of the sample to the ph paper and not dip the paper in the solution (to avoid contamination, yea i know is minor but is a good habit)





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CharlieA
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[*] posted on 31-3-2019 at 16:54


I don't see much difference between applying a drop to the paper (which is 1 color before being placed in contact with the test solution) or the paper to the solution, except for the possibility of contamination as Ubya stated above (ciao, senore). Bringing a drop to the paper is best practice.
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