fusso
International Hazard
Posts: 1922
Registered: 23-6-2017
Location: 4 ∥ universes ahead of you
Member Is Offline
|
|
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?
|
|
|
SWIM
National Hazard
Posts: 970
Registered: 3-9-2017
Member Is Offline
|
|
I've never even seen either of those.
How about pink?
Or blue?
Or that Hydrion wide range multi-color stuff?
|
|
|
fusso
International Hazard
Posts: 1922
Registered: 23-6-2017
Location: 4 ∥ universes ahead of you
Member Is Offline
|
|
This is the multicolour I'm talking about :
https://www.ebay.com/itm/100pcs-PH-Indicator-Test-Strips-1-1...
|
|
|
draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
|
|
Those ones are generally used for swimming pools and stuff.get both for improved accuracy.
|
|
|
Sulaiman
International Hazard
Posts: 3698
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Offline
|
|
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.
CAUTION : Hobby Chemist, not Professional or even Amateur
|
|
|
Ubya
International Hazard
Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline
Mood: I'm a maddo scientisto!!!
|
|
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)
---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
|
|
|
CharlieA
National Hazard
Posts: 646
Registered: 11-8-2015
Location: Missouri, USA
Member Is Offline
Mood: No Mood
|
|
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.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
