Soluble salt and insoluble salt
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Acids and Bases / By
Acids and Bases / By
This article is about the common soluble and insoluble salts.
Methods of protection from rusting
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Metals / By
Metals / By
This article introduces the three main approaches to prevent iron from rusting.
1. Coating
2. Preventing iron from losing electrons
3. Alloying
Coloured ions
Microscopic World I
Many compounds have a colour. Different ions in aqueous solutions have different colour. By observing the colour of the aqueous solution, the ion species in the solution could be predicted preliminarily. The below are the colours of some ions that you need to memorise: Orange: Dichromate ion (Cr2O72-) Yellow: Chromate ion (CrO42-) Iron(III) ion (Fe3+) …
Laboratory safety
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Planet Earth / By
Planet Earth / By
Laboratory safety is the No. 1 priority in conducting experiments. Here are the key safety precautions: Wear safety goggles Wear protective gloves Conduct the experiment inside a fumehood What safety precautions should be taken when diluting concentrated nitric acid? Wear protective gloves Wear safety goggles Perform the dilution in a fume hood Dance around …