"The second tube contains a mixture of Br2 and CCl4, this converts Methane gas to Methyl Bromide..." Br2, Bromine: "Breathing bromine gas could cause you to cough, have trouble breathing, get a headache, have irritation of your mucous membranes (inside your mouth, nose, etc.), be dizzy, or have watery eyes. Getting bromine liquid or gas on your skin could cause skin irritation and burns." CCl4, Carbon Tetrachloride: "Short-term, or acute, exposure to high levels of carbon tetrachloride in drinking water damages the liver and kidneys. Other symptoms include headache, dizziness, tiredness, weakness and blurred vision. Very high doses can also cause vomiting, stomach pain or death." Methyl Bromide: "Methyl bromide is highly toxic. Studies in humans indicate that the lung may be severely injured by the acute (short-term) inhalation of methyl bromide. Acute and chronic (long-term) inhalation of methyl bromide can lead to neurological effects in humans." Buon appetit, y'all.
You can remove the Co2 with soda solution or soda on fabric. It forms Sodiumhydrogencarbonat. wenn you let it dry at 60C you can remove the co2 and use the soda again. Or fast in an stove at 200C.
KOH, Potassium Hydroxide, is the Kissing Cousin of Sodium Hydroxide, AKA Lye or Soda Ash. It reacts virtually the same in virtually all reactions. Although there is no difference in their reactivity levels, I believe the Author is using Potassium Hydroxide because it's a bit less toxic than Lye. But, considering he's also playing with Bromine and Bromides, I can't see why he'd bother.
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