Difference between revisions of "Chemistry of common things"
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Revision as of 17:41, 13 July 2019
Trees, O2, CO2
Demineralized and distilled water
- Distilled is nearly-pure H2O, because distillation moves just the water and leaves behind most other things
- demineralized means few to no minerals (fresh natural water has some, tapwater has a more-controlled bunch; see also hard water) but says little about what else may still be in there.
- it's very useful to keep minerals out of chothes irons, car batteries, and such (mainly to avoid limescale)
- Contaminants in demineralized water
Demineralized water often mentions it is not fit for consumption
- largely because depending on the process of demineralization, there may be other things still left in there, say, a few bacteria. Your iron or battery won't care, but you might
- (also in part because it's also sold in supermarkets so it's useful to point that out explicitly)
In practice it's usually pretty clean water, but it's not guaranteed to be.
- On nutritional deficiency:
In theory there are additives in tap water, mostly a few minerals/salts, some which we need, some less so. Most common are calcium, sodium and magnesium (calcium may be there already depending on the water source).
The idea of adding fluorine for teeth turned out to have some negative side effects so is generally being phased out.
These minerals won't be in distilled water or in demineralized water.
Water is not enough for a daily recommended dose of anything, but it certainly helps when you don't have other regular (food-based) intake for some of these.
If you structurally drink only distilled instead of tap water, you may need to pay a little more attention to what you eat. Which is why generally you wouldn't want to.
- Water poisoning
tl;dr: You are at negligible increased risk.
Water poisoning happens when drinking a large amount of any water in a short time, because of other balances (think salt and other electrolytes). Diluting yourself this with a lot more water eventually causes effects like osmosis taking necessary salts out of your kidney.
However, it is primarily salt in our food is what helps keep this salt balance, not the trace amounts of salts in tap water.
So if you eat anything salty you're good.
And you'll probably crave it if you're low on it.
Yes, if you drink only water - any water - and eat absolutely nothing for two weeks you'll probably be dead. Maybe statistically slightly sooner for distilled and slightly later for tap. Not your main problem at this time...