fusso - 31-3-2019 at 08:02
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?
SWIM - 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?
fusso - 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...
draculic acid69 - 31-3-2019 at 08:43
Those ones are generally used for swimming pools and stuff.get both for improved accuracy.
Sulaiman - 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.
Ubya - 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)
CharlieA - 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.