1) The substance contains calcium because calcium compounds burn with a brick red flame and lithium compounds burn with a crimson flame.
2) The blue precipitate of copper hydroxide has formed. This means the compound originally contained Copper ions.
3) Magnesium, Aluminium and Calcium all dissolve in sodium hydroxide to form white precipitates.
If the precipitate dissolves in excess NaOH then it contains Aluminium ions.
If it burns brick red in a flame test as well as producing a white precipitate in NaOH it contained Calcium ions.
The remaining substance contains magnesium ions.
4) To detect a sulfate ion dissolve the substance in dilute hydrochloric acid and add barium chloride. A white precipitate of barium sulfate forms if sulfate ions were present in the original compound.
5) Iodide ions are present. This is because when an iodine compound is dissolved in dilute nitric acid and silver nitrate solution is added, a yellow precipitate of silver iodide is formed.
6) When you add a dilute acid to a carbonate compound, the gas carbon dioxide is released. This can be detected by bubbling the emergent gas through limewater, turning it cloudy.
Is that what you were getting at?
Also, could anyone be so kind as to explain to me the details of how fusarium is fermented to produce mycoprotein? I just never know how much detail we're supposed to know of the process..
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