March 29, 2020, 09:34:27 PM
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Topic: Bromothymol blue stained salt  (Read 193 times)

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Offline LukaAck

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Bromothymol blue stained salt
« on: February 20, 2020, 06:49:19 PM »
In chem, we did a lab involving the creation of salt using an acid and base. The indicator we used was bromothymol blue, which displayed the pH of the neutralized solution(color was blue-green). Anyways, the salt my group produced ended up being stained a blue color(which would indicate a basic solution). We used a burette and added 28mL of 1 M sodium hydroxide to 25mL of 1 M hydrochloric acid. Could less base be used in order to create non-stained pure salt, or could it be an issue with the saturation of the solution after we heated it up?
« Last Edit: February 20, 2020, 08:27:25 PM by LukaAck »

Offline chenbeier

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Re: Bromothymol blue stained salt
« Reply #1 on: February 21, 2020, 02:41:07 AM »
To use a Indicator to get the salt is not a good idea, because the salt will be every time stained with the colour. Better is to use a pH probe and titrate to pH 7. No colour involved.

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