Silver_Is_Money
Larry Sayre, Developer of 'Mash Made Easy'
Alkalinity kits can make it nigh on impossible to accurately determine the Alkalinity [as CaCO3 in mg/L (ppm)] of RO water. This is an alternative method:
RO Water alternative Alkalinity determination:
Givens:
1 drop from a standard 'old style' medicine type eye dropper (generally these are glass tubes with a rubber squeeze bulb) ~= 0.10 mL (presumed, or you can compute this for greater precision)
For purely trivial reference: 1 single eye dropper drop of 10% Phosphoric Acid (presuming that it is 0.10 mL) should drop 10L of fresh pH 7.00 deionized (DI) water to a pH of 4.96
For actual reference: 1 drop of 10% Phosphoric Acid removes 0.107885 mEq's of Alkalinity to "specifically" a pH of 4.96.
For actual reference: 1 mEq of Alkalinity (as CaCO3) = 50.04345 mg of CaCO3 by weight
Therefore, on to the Alkalinity test:
1) Add 1 eye dropper drop of 10% Phosphoric Acid to 10L of your RO water, mix well, and measure its pH at 20 degrees C.
2) Continue adding eye dropper drops one at a time, mixing well, and measuring the RO waters pH at 20 degrees C. until the RO water finally hits or goes below a measured pH of 4.96. Carefully count how many drops of 10% Phosphoric Acid this took.
3) Multiply the total number of eye dropper drops x 0.107885. Record your answer as "mEq's_acid".
4) Alkalinity mg/L (~ppm) computation:
mEq's_acid x 50.04345 = "mg of CaCO3" present within your test volume of RO water.
Answer = "mg of CaCO3"/Liters = mg/10L = mg/L Alkalinity ~= ppm Alkalinity
Reference Hint: 15 eye dropper drops of 10% Phosphoric Acid into 10 Liters of RO to reach 4.96 pH = ~8.1 mg/L (ppm) Alkalinity, or 30 drops = ~16.2 mg/L (ppm) Alkalinity
RO Water alternative Alkalinity determination:
Givens:
1 drop from a standard 'old style' medicine type eye dropper (generally these are glass tubes with a rubber squeeze bulb) ~= 0.10 mL (presumed, or you can compute this for greater precision)
For purely trivial reference: 1 single eye dropper drop of 10% Phosphoric Acid (presuming that it is 0.10 mL) should drop 10L of fresh pH 7.00 deionized (DI) water to a pH of 4.96
For actual reference: 1 drop of 10% Phosphoric Acid removes 0.107885 mEq's of Alkalinity to "specifically" a pH of 4.96.
For actual reference: 1 mEq of Alkalinity (as CaCO3) = 50.04345 mg of CaCO3 by weight
Therefore, on to the Alkalinity test:
1) Add 1 eye dropper drop of 10% Phosphoric Acid to 10L of your RO water, mix well, and measure its pH at 20 degrees C.
2) Continue adding eye dropper drops one at a time, mixing well, and measuring the RO waters pH at 20 degrees C. until the RO water finally hits or goes below a measured pH of 4.96. Carefully count how many drops of 10% Phosphoric Acid this took.
3) Multiply the total number of eye dropper drops x 0.107885. Record your answer as "mEq's_acid".
4) Alkalinity mg/L (~ppm) computation:
mEq's_acid x 50.04345 = "mg of CaCO3" present within your test volume of RO water.
Answer = "mg of CaCO3"/Liters = mg/10L = mg/L Alkalinity ~= ppm Alkalinity
Reference Hint: 15 eye dropper drops of 10% Phosphoric Acid into 10 Liters of RO to reach 4.96 pH = ~8.1 mg/L (ppm) Alkalinity, or 30 drops = ~16.2 mg/L (ppm) Alkalinity