When cl2 gas reacts with hot and concentrated sodium hydroxide solution?
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I do not need to tell you to wear spex and a lab coat. Take 120⋅g of caustic soda in a large beaker (500−1000⋅mL), and add 50⋅mLor so of water, and STEP BACK.
The dissolution of caustic soda is quite exothermic, and the mix might spit at you, so safety spectacles to protect your mince pies, and a lab coat to protect your clothes are absolute requirements.
Once the initial reaction is over, the volume can be made up to 100⋅mLby adding the lye to water, never the reverse (i.e. as you would to dilute an acid!). But please remember this is a zippy reaction so take care.
Note also that base burns are quite insidious. You get splashed by an acid, it stings, and you wash it off pdq. Get splashed by base and it does not sting: it still does damage, but the soapy, slimy nature of bases means that you might not notice the burn, until it has done some damage
The reaction of chlorine gas with hot and concentrated sodium hydroxide solution is
3Cl2 + 6NaOH → NaClO3 + 5NaCl + 3H2O
Oxidation number of Cl is 0 in Cl2, -1 in NaCl and +5 in NaClO3.
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