When I went to use my universal indicator solution this morning which I purchased earlier this year I found it is distinctly red instead of green. This has never happened to me before. Is it still ok to use, how do I get it back to green? Any help would be much appreciated.
Anastasia
Search found 62 matches
- 06 Nov 2013, 12:32
- Forum: Chemistry and Labware - General
- Topic: Universal Indicator solution
- Replies: 5
- Views: 3267
- 29 Aug 2012, 11:23
- Forum: Safety with Chemicals
- Topic: Fume Cabinet testing
- Replies: 5
- Views: 2605
Re: Fume Cabinet testing
I would also like to know what the minimum requirements are as well as we get ours tested every 6 months by Dynaflow.
- 17 Jul 2012, 12:24
- Forum: Biology, Physics...
- Topic: human pathogens in agar plates
- Replies: 20
- Views: 8977
Re: human pathogens in agar plates
I don't think it's a good idea, we certainly don't do it at my school. We stick to skin and surface swabs (but not from the toilet blocks) and get good enough results from these. You are also right that sealing all the way round is not good either, just tape in three spots.
- 21 Mar 2012, 10:41
- Forum: Safety with Chemicals
- Topic: waste bottle labels
- Replies: 18
- Views: 7253
waste bottle labels
Hi everyone,
I wanted to know where you print your hazard labels from for waste bottles(e.g. heavy metal, halogenated) or if you make up your own what you include. Some photos would be good if possible.
Thanks in advance
Anastasia
I wanted to know where you print your hazard labels from for waste bottles(e.g. heavy metal, halogenated) or if you make up your own what you include. Some photos would be good if possible.
Thanks in advance
Anastasia
- 18 May 2011, 09:26
- Forum: Sourcing Materials & Eq Repairs
- Topic: Frozen rats
- Replies: 5
- Views: 2072
Re: Frozen rats
Thanks all for your replies, from another source I have just found out that whole animal dissections are generally not to be done in schools according to the Animal Welfare act 2004 section 6 and if schools insist on doing them they need to apply to the Ethics Comitttee for approval. So that does it...
- 17 May 2011, 09:38
- Forum: Sourcing Materials & Eq Repairs
- Topic: Frozen rats
- Replies: 5
- Views: 2072
Frozen rats
Hi everyone, Was wondering where you all buy your frozen rats from. I had placed an order with Southern Biological last week but they rang me just now to say their supply of frozen rats was not as abundant as in the past and they could not tell me when and how many they would be able to get at any o...
- 23 Mar 2011, 14:00
- Forum: Miscellaneous
- Topic: Physical Phenomena Experiments - Science in a box
- Replies: 73
- Views: 22589
- 10 Nov 2009, 12:22
- Forum: Recipes and Pracs
- Topic: Barium sulfate substitute
- Replies: 6
- Views: 2643
Re: Barium sulfate substitute
The barium sulfate is usually sprinkled on the soil and then universal indicator dropwise on top of the barium sulfate. The colour of the barium sulfate can then be compared with a colour chart. So replace barium sulfate with baby/talcum powder, I have heard it works but have not seen it myself.
- 10 Nov 2009, 11:56
- Forum: Recipes and Pracs
- Topic: Barium sulfate substitute
- Replies: 6
- Views: 2643
Re: Barium sulfate substitute
I believe you can use baby/talcum powder instead.
- 28 Jun 2007, 14:31
- Forum: Sourcing Materials & Eq Repairs
- Topic: Dilute H2O2
- Replies: 5
- Views: 2544
Re: Dilute H2O2
When diluting any liquid simply use the formula M1 x V1 = M2 x V2 where M = concentration V = volume So to make up 250ml of 6% hydrogen peroxide from 35% 0.35 x V1 = 0.06 x 0.250 therefore V1 = 0.043 this means that you take 43ml of the 35% hydrogen peroxide and then add distilled water to make up 2...
- 02 Apr 2007, 09:04
- Forum: Biology, Physics...
- Topic: spirit burner wicks
- Replies: 2
- Views: 1769
- 29 Mar 2007, 14:17
- Forum: Biology, Physics...
- Topic: spirit burner wicks
- Replies: 2
- Views: 1769
spirit burner wicks
I am having difficulty inserting a new rope wick into a spirit burner. Does anyone know how itis done??
Anastasia
Anastasia
- 12 Mar 2007, 10:27
- Forum: The Lab Tech Position
- Topic: Notice for lab requests
- Replies: 10
- Views: 4764
- 08 Mar 2007, 13:16
- Forum: The Lab Tech Position
- Topic: Notice for lab requests
- Replies: 10
- Views: 4764
Notice for lab requests
Hi All,
I was just wondering how much notice you insist on being given for lab requests by the teachers? I often get given half a days notice even for pracs requiring the preparation of chemicals and hate feeling rushed. Do I refuse to prepare these??
Anastasia
I was just wondering how much notice you insist on being given for lab requests by the teachers? I often get given half a days notice even for pracs requiring the preparation of chemicals and hate feeling rushed. Do I refuse to prepare these??
Anastasia
- 30 Nov 2006, 13:16
- Forum: Safety with Chemicals
- Topic: Chemwatch MSDS
- Replies: 11
- Views: 4373
- 30 Nov 2006, 12:07
- Forum: Chemistry and Labware - General
- Topic: chlorophyl chromatography
- Replies: 4
- Views: 2411
- 28 Nov 2006, 13:18
- Forum: Chemistry and Labware - General
- Topic: chlorophyl chromatography
- Replies: 4
- Views: 2411
chlorophyl chromatography
Hi All, Our year 8's are having a problem running a successful chromatogram of extracted chlorophyl. We are using green and brownish leaves off a cherry blossom tree, extracting the chlorophyl in an ethanol water bath and the result is a uniform green streak, no bands of colour. We also tried rubbin...
- 23 Nov 2006, 12:23
- Forum: Sourcing Materials & Eq Repairs
- Topic: Repairing power supply
- Replies: 2
- Views: 1949
- 21 Nov 2006, 11:10
- Forum: Sourcing Materials & Eq Repairs
- Topic: Repairing power supply
- Replies: 2
- Views: 1949
Repairing power supply
Hi All,
Any suggestions on who to contact to repair an IEC high voltage power supply (5000V) would be much appreciated. Preferably in the Sydney metrolpolitan area.
Also who is the best supplier for pads of graph paper? Our usual supplier does not stock them any more.
Any suggestions on who to contact to repair an IEC high voltage power supply (5000V) would be much appreciated. Preferably in the Sydney metrolpolitan area.
Also who is the best supplier for pads of graph paper? Our usual supplier does not stock them any more.
- 06 Nov 2006, 13:26
- Forum: Safety with Chemicals
- Topic: storing dilute solutions
- Replies: 6
- Views: 3757