Cleaning a Pear shape Flask

Post by **Labbie** » 16 Mar 2007, 09:49

The senior chemistry class, managed to burn the solution in a pear shape flask. Any ideas on how to remove this stain. I have currently tried.
Oxalate Acid Soaked over the weekend
HCL soaked for about 4 days.

Any helpers

J · Post by J » 16 Mar 2007, 10:30

Hi Pommy

Something I have filed away as potentially useful information, but have not tried, is: for any carbon deposit, dissolve 6g trisodium phosphate and 3g sodium oleate in 100ml water. Use this solution to soak. If you have these chemicals on hand it may be worth a try.

Good luck

Julie

ri · Post by ri » 16 Mar 2007, 10:37

Hi Pommy,
a good glassware soaking solution is Pyroneg detergent.
(available from Science Supply, 1300 857 544, 3kg approx. $55.)
Good luck with this one - a difficult problem!
~Robyn

bindi · Post by **bindi** » 16 Mar 2007, 10:53

Dont Laugh

!
Try 'napysan' over night. (not sure how its spelt?)
Not only does it remove stains from clothing but also.....pots, pans and glasswear!

Post by **Labbie** » 16 Mar 2007, 12:48

As I have three flask, I will be trying all three. I'll get back to you on Monday. To see what happens.

Regards

Post by **Labbie** » 19 Mar 2007, 07:36

The nappy San won, hands down. Came in this morning and the burnt on mark had lifted right off.

Thank you so much every one. We shall be purchaseing Nappy San from now on.

Regards

Post by **RosalieM** » 22 Mar 2007, 13:48

Hi,
I am just new to this Chemtalk thing (and new to lab assisting too... this is my 5th week!) and I have some glassware that needs cleaning from before I started. There are various types and amounts of deposits on several items. I have no idea what they are! I was going to ask for cleaning ideas as everything tried so far hasn't worked. Having read this, though, I will bring in some nappysan tomorrow and give it a go.
Thanks for all the useful hints and tips. I'm sure I will be using Chemtalk regularly!
Rosalie

Post by **Robb** » 22 Mar 2007, 15:17

Hi All,

A handy hint to use would to to use a Test Tube Brush and Bend the end to fit into the hard - to - reach part of the glass to be cleaned. This helps because you can then use it to physically brush the affected area.

Cheers,

Robb......

Post by **RosalieM** » 26 Mar 2007, 10:09

Thanks guys!
I have nice clean glassware now

Next time I go shopping I will be purchasing some napisan to keep handy in the science lab!
Rosalie

Post by **Labbie** » 05 Jun 2007, 11:20

bindi wrote:Dont Laugh !
Try 'napysan' over night. (not sure how its spelt?)
Not only does it remove stains from clothing but also.....pots, pans and glasswear!

It really is just great

Something went wrong, this was to be Simple Top Tip

Sorry folks

Australia's Science Forum

Cleaning a Pear shape Flask

Cleaning a Pear shape Flask

Cleaning a pear shaped flask.

cleaning glassware

Cleaning Glassware

clean glassware

Simple top tip