Hi,
Could anyone help me with instructions on how to make Eriochrome Black T which is used as an indicator in water hardness determinations. The experiment asks for 2 or 3 drops and the only info I can find is add 0.5g indicator to 100g NaCl powder and use 0.2g.
Thanks Tracey
Eriochrome Black T
Re: Eriochrome Black T
Hi
Make the indicator as follows:
Eriochrome Black-T Indicator. Place 1 gram Eriochrome Black-T and 9 grams of hydroxylamine hydrochloride into a 250-ml glass stock bottle, add 200 ml of reagent grade alcohol, and mix until dissolved. Record the date the indicator is prepared and discard after 3 months.
Kim
Make the indicator as follows:
Eriochrome Black-T Indicator. Place 1 gram Eriochrome Black-T and 9 grams of hydroxylamine hydrochloride into a 250-ml glass stock bottle, add 200 ml of reagent grade alcohol, and mix until dissolved. Record the date the indicator is prepared and discard after 3 months.
Kim
Re: Eriochrome Black T
Easier methord
Dissolve 1g in 75 ml of commercial Ammonia solution and add 25ml of ethanol.
From Heinemann Chem Prac Manual
Dissolve 1g in 75 ml of commercial Ammonia solution and add 25ml of ethanol.
From Heinemann Chem Prac Manual
