Ferric sulfate Fe2(SO4)3 act to precipitate ferric hydroxide, coagulate at 4.0 - 11.0 pH range.


Related Terms

PH METER

An electronic voltmeter using a pH-responsive electrode that gives a direct conversion of voltage differences to differences of pH at the temperature of the measurement.

BASICITY

The ability of a substance to boost the pH after neutralizing all the acid species.

PHENOLPHTHALEIN ALKALINITY

A measure of the hydroxide ions plus one half of the normal carbonate ions in aqueous suspension. Measured by the amount of sulphuric acid required to bring the water to a ph value or 8.3, as indicated by a change in colour of phenolphthalein.

pH

The hydrogen ion concentration of a water to denote acidity or alkalinity. A pH of 7 is neutral. A pH above 7 denotes alkalinity while one below 7 denotes acidity.

ACIDITY

Represents the amount of free carbon dioxide, mineral acids, and salts (especially sulfates or iron and aluminum) which hydrolyze to give hydrogen ions in water; is reported as milliequivalents per liter of acid, or ppm acidity as calcium carbonate, or pH, the measure of hydrogen ion concentration.

BUFFER SOLUTION

A solution containing two or more substances that, in combination, resist any marked change in pH following addition of moderate amounts of either strong acid or base.

NEUTRALIZATION

Addition of an acid or alkali (base) to a liquid to cause the ph of the liquid to move towards a neutral pH of 7.0.

PHENOLPHTHALEIN

A solution which changes colour from white to red in solutions with a pH of 8.3 or greater.

PRECIPITATE

When one chemical constituent comes out of solution with another.

AGGRESSIVE CARBON DIOXIDE

The carbon dioxide dissolved in water in excess of the amount required to precipitate a specified concentration of calcium ions as calcium carbonate; used as a measure of the corrosivity.

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