I have just made some Bromothymol Blue indicator. Method used is: 2g bromothymol blue powder, 100ml ethanol and 500ml distilled water.
My solution is an orange/red colour. Do I add a couple of drops of NaOH to make it go blue? If so, will this effect the titration that year 12 will be doing (HCl, NaOH and vinegar).
Thanks
Bromothymol Blue Indicator
Bromothymol Blue Indicator.
Hi Vick,
What you need to do is to add NaOH (0.5M) until the Bromothymol blue solution changes to green. Only then is it ready for use.
I suggest using 0.5 Molar because the change fron Red/Orange to Green won't be so sudden.
Using Sodium Hydroxide to change the Orange/red colour you currently have to green will not affect the colour change during the Acid/Base pH titrations that your seniors will do.
The colours that the Bromothymol blue will change to are:
Acidic Environment:- Red/Orange
Alkaline Environment:- Blue
Hope this has been helpful.
Cheers,
Robb.....
What you need to do is to add NaOH (0.5M) until the Bromothymol blue solution changes to green. Only then is it ready for use.
I suggest using 0.5 Molar because the change fron Red/Orange to Green won't be so sudden.
Using Sodium Hydroxide to change the Orange/red colour you currently have to green will not affect the colour change during the Acid/Base pH titrations that your seniors will do.
The colours that the Bromothymol blue will change to are:
Acidic Environment:- Red/Orange
Alkaline Environment:- Blue
Hope this has been helpful.
Cheers,
Robb.....
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **