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Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 11:03
by Labbie
One lovely teacher, has some burnt sugar in our new test tubes, about 22 of them. Any ideas how to remove this mess
I have tried really HOT HOT water, & soaked over night with oxalate acid. Help
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 11:12
by RosalieM
Haven't had to deal with that problem, but bi-carb soda or napisan seems to work for just about anything. Worth a shot! Good luck
Rosalie
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 11:46
by Ocean Breeze
just soak them is some Na OH overnight. They will just rise clean in the morning! No scrubbing required
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 12:36
by Lyn
What strength NaOH would you recommend? I have several evaporating basins with charred remains from a jelly crystal prac which no amount of scrubbing is moving.
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 13:13
by dime
1M or 2M max NaOH should do the trick. It will loosen just about anything. Even melted (sublimed?) sulfur from test tubes or deflagrating spoons. Might need to leave them for a couple of days, just keep soaking till the stuff lifts off. Have a nice weekend all :
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 13:20
by Labbie
I had forgotton about Nappy Sand, Silly me, but we have run out of that. So I will have a go with Sodium Hydroxide, I have some Old 3M which I could use up, as a cleaning Acid. Thank you again
Re: Clean burnt Sugar from glassware
Posted: 09 Nov 2007, 13:46
by ellice
We keep a stock of small test tubes (7x1cm) for burning sugar. Then I just throw them away!
Re: Clean burnt Sugar from glassware
Posted: 11 Nov 2007, 18:21
by Labbie
Yes so do I, but this teacher helped him self. He did'nt ask, just went ahead and did it.
That Nappy San is really good.
