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NaOH gets very hot when it dissolves in water – we want our water warm for the Sodium Sulphite step, but we don’t want the plastic bottle to overheat. This is an issue when we add 20g of NaOH to the little amount of under 250ml of water. To make sure stuff stays at a reasonable temperature, directly after adding the NaOH I capped my bottle and put it under running cold tapwater – and gently (that’s a lie, I’m impatient, but you shouldn’t) mixed it controlling the temp with my built-in proprietary heat sensors – my hands – till it all dissolved. Ish.
