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Dear Anantika,
The silica garden is prepared by placing crystals of various
coloured salts ( Apr. 0.4 mm size) in a magic solution of sodium
silicate prepared as above taken in a clean glass container .
In a few hours hollow tubes of metallic silicate gets shootup from these crystals which look like trees. If you add too
many crystals the solution will turn cloudy and immediate
precipitation will occur. A slower precipitation rate will give
you a nice garden. Once the garden grown , you can replace
the sodium silicate solution carefully with pure water. Initially
a colloidal and semipermeable shell of silicate is formed around
the crystal. Inside this is a strong solution of the salt and out side
is a weak solution of sodium silicate. Hence water permeates
into the shell and pressure rise until the shell bursts. At this
stage the salt solution escapes but immediately comes in the
contact with the sodium silicate solution and react with it to
form again semipermeable shell of the metallic silicate. Thus
the original condition is reproduced over and overagain and a
projection of silicate continusly grow.The optimal concentration of magic solutio lie between
1.56 M and 0.625 m with respect to si9lica in experiment
where growth of silica tubes is vigorous. More concentated
solutionproduce meagre growth and thre is vigorous growth
from intermediate concentration while the more diluted
solution produces mearly a gelatinous mass. In more
concentrated solution the semipermeable membraneof
sodium silicate surrounding the seed crystal is broken
only with difficulty to produce the growth of tube. On the
other hand in dilute solution the membrane that is formed
acquire a more plassticcharacter and is not easily rupture
rather distords without breaking.
Best Of luck
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Thanks
Aman Bansal
Askiitian Expert
Dear Anantika Mittal,
SILICA GARDEN
This is an interesting chemical experiment which beautifully
express the phenomenon of osmosis through semipermeable
membrane of silica gel. It looks a magic where colourful silica
grow in solution appear as colourful flowring garden The magic
solution in which garden grow is a solution of sodium silicate in
water. It is prepared by diluting water glass (concentrated
solution of sodium silicate available in market) five times with
distilled water. Salts used to make magic rocks which readily
available are:
Purple- Manganese chloride
Blue- Copper sulphateRed- Cobalt chloridePink- Manganese chlorideOrange- iron chlorideYellow- Iron chlorideGreen - Nickel nitrateWhite- Lead nitrateThe silica garden is prepared by placing crystals of various
Best Of Luck........
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