are these reagents equivalent?

[Solvangswimmers]

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]

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]

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]

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.