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9.5 Making and using pH test strips of Red Cabbage extract | |
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9.5 Making and using pH test strips of Red Cabbage extract | |
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1.+ and - qualifier : Examples : +always -never
If you prepend a word with + that word is required to be on the page.
If you prepend a word with - that word is required to not be on the page.
2.* wildcard : Examples : *owned or gift*
If a query word starts or ends with a * all words on a page which end or start the same way
as that query word will match.
3.? wildcard : Examples : a?sorb, a?sor?tion or gift?
If a query word contains a ? any character will match that position.
All of these techniques can be combined: +alway* -ne??r*
To make test strips :
[a] Chop up dark red cabbage leaves, insert in a container, cover with freshly boiled water and allow to cool.
[b] Drain liquid through a strainer, saturate filter papers in the liquid, dry and cut into strips. Store strips in dry, sealed plasticware.
Test pH by placing a drop of juice or extract on a strip :
[pH 0 is the lower limit in water]
below pH 2 is generally toxic to plants
few plants thrive in the pH 2 to 4 range
pH 4 to 6 is good acid-loving plant range
most plants prefer the pH 6 to 7 range
pH 7 to 7.5 is a good alkali-loving plant range
few plants survive at pH 7.5 to 9
above pH 9 to 10 is generally toxic to plants
pH 10-12 sanitizes - kills most life
over pH 12 hydrolyzes most organics - sterilizes above this pH
[pH 14 is the upper limit in water]
(*) : Use sunlight or incandescent lighting.
Fluorescent lighting can affect colour perception [eg hide red].
Frank Pownall : Sales & Marketing
FAX : +61 8 6380 1499 TEL : +61 418 364 880 EMAIL : frank@plantsfood.com
David Martin Menne : Technical Support
FAX : +61 8 9389 5647 TEL : +61 500 54 65 32 EMAIL : david@plantsfood.com