(a) Boiling
(21) Filtration means to pass the water
through a fine mesh cloth or ab-
(b) Chemical
sorbent cotton. Impurities will
precipitation
be collected by the cloth or cotton.
(c) Distillation
Add the two missing methods used to
purify water to list below.
(a) Boiling.
(b) Chemical precipitation.
(c) ______________________
(d) ______________________
(c) Distillation
(22) List four methods used to purify
water.
(d) Filtration
(a) ______________________
(b) ______________________
(c) ______________________
(d) ______________________
(a) Boiling.
(c) Distillation.
(b) Chemical
(d) Filtration.
EXERCISE
3.
Impurities can be removed from water used to mix photographic materials by (select one)
a.
boiling.
b.
filtering through a wire mesh.
c.
boiling and adding formaldehyde.
d.
adding 3% acetic acid.
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