Below is a comment on Alkalinity which most aquarist attribute to entirely KH, bicarbonate. This is not the case for many tap water supplies however.
Perhaps you might get lucky and it is all bicarbonate???
How do you know?
Have you tested for the other forms and measured total vs bicarbonate?
If not, then you cannot say, you can guess.....but you cannot say or confirm it.
"CALCULATION OF ALKALINITY RELATIONSHIPS
Results obtained from Phenolphthalein and Total Alkalinity
determinations offer a means for the stoichiometric classification of
three principal forms of Alkalinity present in many water supplies.
Classification attributes the entire alkalinity to bicarbonate, silica,
phosphoric and boric acids. This classification system further assumes
incompatilibity of Hydroxide and Bicarbonate Alkalinities in the same
sample.
Since calculations are on a stoichiometric basis, ion concentrations in the strictest sense are not represented in the results.
According to this scheme:
A. Carbonate Alkalinity is present when Phenolphthalein is not zero
but is less than the Total Alkalinity.
B. Hydroxide Alkalinity is present if Phenolphthalein Alkalinity is
more than one-half the Total Alkalinity.
C. Bicarbonate Alkalinity is present if Phenolphthalein Alkalinity is
less than one-half the Total Alkalinity."
http://www.lamotte.com/pages/common/pdf/instruct/3467.pdf
Regards,
Tom Barr
Perhaps you might get lucky and it is all bicarbonate???
How do you know?
Have you tested for the other forms and measured total vs bicarbonate?
If not, then you cannot say, you can guess.....but you cannot say or confirm it.
"CALCULATION OF ALKALINITY RELATIONSHIPS
Results obtained from Phenolphthalein and Total Alkalinity
determinations offer a means for the stoichiometric classification of
three principal forms of Alkalinity present in many water supplies.
Classification attributes the entire alkalinity to bicarbonate, silica,
phosphoric and boric acids. This classification system further assumes
incompatilibity of Hydroxide and Bicarbonate Alkalinities in the same
sample.
Since calculations are on a stoichiometric basis, ion concentrations in the strictest sense are not represented in the results.
According to this scheme:
A. Carbonate Alkalinity is present when Phenolphthalein is not zero
but is less than the Total Alkalinity.
B. Hydroxide Alkalinity is present if Phenolphthalein Alkalinity is
more than one-half the Total Alkalinity.
C. Bicarbonate Alkalinity is present if Phenolphthalein Alkalinity is
less than one-half the Total Alkalinity."
http://www.lamotte.com/pages/common/pdf/instruct/3467.pdf
Regards,
Tom Barr