are these reagents equivalent?

Solvangswimmers

Active member
Jun 5, 2009
34
I need to refill the tiny bottle of Phenol Red in my Taylor test kit. The number on the little bottle is R-0004. I thought I was ordering the same thing (from Leslies) and the 2 oz bottle says R-1003J. Its labeled pH Indicator Solution, Phenol Red. Is it the same??

TIA!

Heather
 

waste

TFP Expert
LifeTime Supporter
Mar 29, 2007
4,160
Coastalish 'down easter'
Sorry, I don't think so :(

The R0004 supports the acid and base demand tests and I'm pretty sure the others don't.

The color may turn the right shade for the comparator (again, not sure - the concentration may be off for the water sample size)
 

Solvangswimmers

Active member
Jun 5, 2009
34
GAH!!! And I bought 2 oz to get free shipping!

I still have some R0004 so I will do a a test with each and compare the results
 

JasonLion

TFP Expert
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LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
R-1003J is designed for an 11.5 ml test cell, while R-0004 is designed for a 44 ml test cell, so the concentrations are very different. I'm fairly sure that if you use four times as much R-1003J as you would have used of R-0004 that it will behave the almost exactly the same. A quick test with both reagents should be able to confirm that fairly easily.
 
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