دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: any substance or combination of substances that, when dissolved in water, produces a solution that resists a change in its hydrogen ion concentration with the addition of acid or base.

a chemical used to keep the pH in a certain range without extremes of high or low pH.

n: a measure of the acidity or alkalinity of a solution, normally expressed as pH. See pH.

n: a measure of the acidity or alkalinity of a solution, normally expressed as ph. See also ph

n: I. a dial gauge used on the rig to measure the hookload. 2. substances in acid-base titrations that, in solution, change colour or become colourless as the hydrogen ion concentration reaches a definite value, these values varying with the indicator. In other titrations. such as chloride, hardness, and other determinations, these substances change colour at the end of the reaction. Common indicators are phenolphthalein and potassium chromate.