indicator pH1-14
indicator pH1-14
Is there a recipe for making up Universal Indicator that goes from pH1-14 instead of 4-11. I know that you can buy it in test strips, but as i make up my own universal I've been looking for a recipe, unsuccessfully! Perhaps its just too complicated.What do you think labbies??
Re: indicator pH1-14
0.1gm phenolphthalein, 0.2gm methyl red, 0.3 gm methyl orange, 0.4gm bromothymol blue, 0.5 gm thymol blue.
dissolved in 500 mLs of 50% ethanol.
This is another one:
Stock solution:
To make 1 Litre
0.05 gm Thymol Blue
0.125 gm Methyl Red
1.00 gm Phenolphthalein
0.50 gm Bromothymol Blue
1 Litre Ethanol
Dissolve the four indicators in the Ethanol.
Solution should be green in colour (neutral).
Adjust using 0.05M Sodium Hydroxide dropwise.
dissolved in 500 mLs of 50% ethanol.
This is another one:
Stock solution:
To make 1 Litre
0.05 gm Thymol Blue
0.125 gm Methyl Red
1.00 gm Phenolphthalein
0.50 gm Bromothymol Blue
1 Litre Ethanol
Dissolve the four indicators in the Ethanol.
Solution should be green in colour (neutral).
Adjust using 0.05M Sodium Hydroxide dropwise.
Re: indicator pH1-14
Thanks a bunch Sunray18, I'll give it a shot . What a fabulous collective of knowledge you all are!!!
