Key Difference â Aggregate vs Average Aggregate and average are two terms that are often used in calculations. However, these two terms mean two different things. Aggregate refers to the total sum of elements in a data set whereas average refers to the central value in a dataset. This is the key difference between aggregate and average. What Does Aggregate Mean? Aggregate is an adjective and a noun which refers to something formed or calculated by the combination of several separate elements.
Hypochlorous acid and hypochlorite ions, when combined, is known as free chlorine. Both of these establish equilibrium and are both temperature and pH dependent at 7.5 pH and 77Â°F (25Â°C). Hypochlorous acid is more potent than hypochlorite ions in terms of disinfection.
If the Free Chlorine (FC) level is very high (> 10 ppm) then the pH reading can be wrong due to chlorine oxidation of phenol red into chlorphenol red which is dark purple. If the FC level is not high, then focus on the hue, not the saturation of the color. If necessary, use fewer drops of the pH indicator. Orange is usually around 7.4.