Sulfuric acid - going brown: Would you please tell me why concentrated sulfuric acid goes brown?
Also, if you use a diluted solution (2M) of the brown acid as part of the standardisation of potassium permanganate, will it work and are results reliable?
Organic chemicals: I have been asked to purchase examples of esters, amides, amines, alkanes and alkenes.
Can someone recommend which of these chemicals are best for school use please?
Tollens Test: For Year 12 chemistry, the teachers wanted to demonstrate the silver mirror, also called Tollens test. The process goes like this:
1) 10 ml of a mixture of glucose with a bit of tartaric acid is poured into a flask.
2) 10 ml of ammonium nitrate and 10 ml silver nitrate are mixed together. This mix is then added to the flask.
3) 10 ml of strong sodium hydroxide is then added to the flask.
chemical storage bottles: Hi, are there any rules about the types of bottles to store chemicals in, in the chemical store room. ie must they have screw lids only or stoppers only.
Hazardous Waste Disposal: Can you please advise on how to deal with hazardous waste, including chemical waste, which type of chemicals go into what type of container, e.g., acids into a corrosives container, ethanol into a flammable waste container.
Calcium hydroxide: I have 2 bottles of Calcium Hydroxide that are moist. Can it be dried out? Or is it no good or Ok as is? Also how do I stop the chemicals from becoming moist?
Drying of anhydrous sodium carbonate: I am about to standardise a sodium hydroxide solution, but I have been wondering about the recommended temperature and time for drying anhydrous sodium carbonate as the first step in the process.
Chemical Storage: Hi, just wanting some clarification on the storage of manganese dioxide, please.
The previous SDS from Chem-Supply has manganese dioxide as DG Class 5.1, the new one (Jan 2016) says Not Classified as a Dangerous Good.
What would be your recommendation for storage, please?
Storage and disposal of deliquescent chemicals - Zinc Nitrate: Hi, My bottle of zinc nitrate has liquid in it and the bottle has expanded. It does not look right.
Calcium oxide disposal: Hi. Can anyone tell me how to dispose of some very old calcium oxide. The container is all swollen and the date on the bottle is Dec 1988.
CSIS says it can be disposed of to landfill, I was just wondering if someone can confirm if that's correct.
