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pH Explained: The Power of Hydrogen
pH is a measure of the acidity or alkalinity of a solution and is an important concept in chemistry. The term "pH" stands for "potential of hydrogen" or "power of hydrogen." It quantifies the concentration of hydrogen ions (H⁺) in a solution, which, in turn, indicates the solution's level of acidity or basicity (alkalinity).
The pH scale typically ranges from 0 to 14, with 7 considered neutral. Here's what the pH values signify:
pH 0-6: Acidic - Solutions with a pH below 7 are considered acidic. Lower pH values indicate stronger acidity, with pH 0 being extremely acidic.
pH 7: Neutral - A pH of 7 indicates a neutral solution, meaning it is neither acidic nor alkaline. Pure water at room temperature is an example of a neutral solution.
pH 8-14: Alkaline (or Basic) - Solutions with a pH above 7 are considered alkaline or basic. Higher pH values indicate stronger alkalinity, with pH 14 being extremely basic.
To calculate the pH value of a solution, you can use the following formula:
pH = -log[H⁺]
Where:
pH is the pH value of the solution.
H⁺ represents the concentration of hydrogen ions in moles per liter (Molarity, M).
Here are the steps to calculate the pH of a solution:
Measure the concentration of hydrogen ions (H⁺) in the solution in moles per liter (Molarity, M). This concentration is often provided in chemical experiments or can be calculated using appropriate techniques.
Take the negative logarithm (base 10) of the H⁺ concentration. You can use a scientific calculator or computer software to perform this calculation.
The result is the pH of the solution.
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