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“pH is a measure of the acidity or alkalinity of a solution. Aqueous solutions at 25°C with a pH less than seven are considered acidic, while those with a pH greater than seven are considered basic (alkaline). When a pH level is 7.0, it is defined as 'neutral' at 25°C because at this pH the concentration of H3O+ equals the concentration of OH- in pure water. pH is formally dependent upon the activity of hydronium ions (H3O+),[1] but for very dilute solutions, the molarity of H3O+ may be used as a substitute with little loss of accuracy.[2] (H+ is often used as a synonym for H3O+.) Because pH is dependent on ionic activity, a property which cannot be measured easily or fully predicted theoretically, it is difficult to determine an accurate value for the pH of a solution. The pH reading of a solution is usually obtained by comparing unknown solutions to those of known pH, and there are several ways to do so.” - http://en.wikipedia.org/wiki/PH“pH is a measure of the acidity or alkalinity of a solution. Aqueous solutions at 25°C with a pH less than seven are considered acidic, while those with a pH greater than seven are considered basic (alkaline). When a pH level is 7.0, it is defined as 'neutral' at 25°C because at this pH the concentration of H3O+ equals the concentration of OH- in pure water. pH is formally dependent upon the activity of hydronium ions (H3O+),[1] but for very dilute solutions, the molarity of H3O+ may be used as a substitute with little loss of accuracy.[2] (H+ is often used as a synonym for H3O+.) Because pH is dependent on ionic activity, a property which cannot be measured easily or fully predicted theoretically, it is difficult to determine an accurate value for the pH of a solution. The pH reading of a solution is usually obtained by comparing unknown solutions to those of known pH, and there are several ways to do so.” - http://en.wikipedia.org/wiki/PH
DO- “The concentration of oxygen dissolved in water,
expressed in mg/l or as percent saturation, where saturation is the maximum
amount of oxygen that can theoretically be dissolved in water at a given altitude
and temperature.” - http://www.biology-online.org/dictionary/Dissolved_oxygen
When air touches water some of the air molecules dissolve into the water but they are still air molecules surrounded by water molecules. It’s easier for the air molecules to get into the water when the water is moving like a lake.
Some pollutants are things like oil, pesticides or other things that come from some industries. Pollutants usually pollute or contaminate the air, water, soil, over all pretty much earth.
Green plants use the sunlight to create nutrients from carbon dioxide and water. This is another way for air molecules to dissolve into water.
The lightest chemical element on earth and is colorless, odorless and since it’s a type of gas it is highly flammable.
ppm-
ppm or parts per million shows for this situation how many air molecules are
dissolved in the water out of the million water molecules surrounding them.
Chimacum Middle School 6th Grade
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