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Chemical Formula. Ca (OH)₂ (Calcium hydroxide) Lime Water Test. Lime water turns milky/cloudy when carbon dioxide is passed through it, indicating the presence of carbon dioxide. Example: CO₂ + Ca (OH)₂ → CaCO₃ + H₂O (Milky/cloudy appearance) Oxidation/Reduction.
To calculate quicklime or hydrated lime dosage, mg/L, use the following equation: Where: A = CO 2 in source water (mg/L as CO 2 x 56/44) B = bicarbonate alkalinity removed in softening (mg/L as CaCO 3 x 56/100) C = hydroxide alkalinity in softener effluent (mg/L as CaCO 3 x 56/100) D = magnesium removed in softening (mg/L as Mg x 56/24.3)
Lime or lime-soda softener control is usually based on treated water alkalinity and hardness. Samples are tested to determine the alkalinity to the P (phenolphthalein, pH 8.3) and M (methyl orange or methyl purple, pH 4.3) end points.
January 2007 Properties of Lime TEMPERATURE vs. pH OF A SATURATED CALCIUM HYDROXIDE SOLUTION Conversion Formula: pH correction = [0.03 pH units/1.0 deg. C] x [Measured Temp deg. C - 25] This equation indicates that for each degree difference between the measured temperature in degrees C and 25 degrees C, there is a change in pH of 0.03 units.
Chemistry. In chemistry, lime water can be used to test the presence of carbon dioxide because lime water reacts with carbon dioxide to produce a precipitate of calcium carbonate : Ca (OH) 2 (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O (l) Lime water is also used in fermentation, to determine whether carbon dioxide was produced.
FORMULA FOR CALCULATING WEIGHTS OF SLURRY For calculating the weights of slurry with varying percentages of water, the following formula may be used: in which: W = weight in pounds of slurry per cubic foot. s = specif c gravity of dry lime solids. a = per cent water in slurry.
lime. Reading time: 25 minutes. Lime is the most widely used reagent in water treatment applications. It is supplied in two forms: quick lime: CaO; slaked (or hydrated) lime: Ca (OH) 2. Warning: in both cases, these reagents will contain between 4 and 20% of solid impurities (CaCO 3, SiO 2 …).
