An example of the precipitation of lime
in water is the deposit that can be found in any teakettle that has been
used for some time.
MINERAL WATER is water containing a large quantity of such minerals as
will go in solution in water, namely, sulphur, iron, lime, etc.
DISTILLED WATER is water from which all minerals have been removed. To
accomplish this, the water is converted into steam and then condensed.
This is the purest form of water.
CARBONATED WATER is water that has had carbon-dioxide, or carbonic-acid,
gas forced into it. The soda water used at soda fountains is an example
of this variety. Carbonated water is bottled and sold for
various purposes.
6. NECESSITY FOR PURE WATER.--The extensive use made of water in the
diet makes it imperative that every effort be exerted to have the water
supply as pure as possible. The ordinary city filter and the smaller
household filter can be depended on to remove sand, particles of leaves,
weeds, and such foreign material as is likely to drop into the water
from time to time, but they will not remove disease germs from an
unclean supply. Therefore, if there is any doubt about water being pure
enough to use for drinking purposes, it should be boiled before it is
used.
Pages:
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387