The higher the H+ concentration, the lower the pH, and the higher the OH- concentration, the higher the pH. At a neutral pH of 7 (pure water), the concentration of both H+ ions and OH- ions is 10⁻⁷ M.
Q. How is pH level calculated?
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = – log [H3O+].
Table of Contents
Q. What solution has a pH of 1?
The pH scale
| Increasing pH (Decreasing Acidity) | Substances |
|---|---|
| 0 (most acidic) | Hydrochloric acid (HCl) |
| 1 | Stomach acid |
| 2 | Lemon juice |
| 3 | Cola, beer, vinegar |
Q. What are two factors that affect the pH of a solution?
What Variables Affect pH Levels?
- Carbon Dioxide. When dissolved in water, carbon dioxide forms a weak acid that can throw off the balance of the pH.
- Acidics and Akalines.
- Sodium and Calcium Hypochlorite.
- Chlorine.
- Air-borne Contaminants.
- Air Pollution.
Q. What happens to the pH of the solution if a little acid is added to water?
Adding water to an acid or base will change its pH. Water is mostly water molecules so adding water to an acid or base reduces the concentration of ions in the solution. When an acidic solution is diluted with water the concentration of H + ions decreases and the pH of the solution increases towards 7.
Q. Is alkaline positive or negative?
In this process, an electrical current is sent through the water, separating the molecules into acidic ions with a positive charge and alkaline ones with a negative charge.
Q. What is the relation between pH and alkalinity?
pH is a measure of how acidic or basic water is. Alkalinity is a measure of the buffering capacity of water – its ability to resist sudden changes in pH. pH and alkalinity can be measured through testing at an accredited lab.
