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Select the option that completes the given sentence correctly. The pH scale is used to measure the level of ________ of a solution.
pollution
acidity or basicity
density
volume
acidity or basicity
The pH scale is a logarithmic scale used to determine the acidity or alkalinity of an aqueous solution. It measures the concentration of hydrogen ions [H+] in the solution.
The pH scale is a logarithmic scale used to determine the acidity or alkalinity of an aqueous solution. It measures the concentration of hydrogen ions [H+] in the solution.
Think of the pH scale like a see-saw: as you add more acidic components (like lemon juice), the H+ concentration goes up, the pH value drops, and it tips toward 'acidic'. Adding basic components (like soap) lowers the H+ concentration, raising the pH number toward 'basic'.
pH = Power of Hydrogen (or Potentia Hydrogenii in Latin).
pH=тИТlog[H+] тАФ Definition of pH based on hydrogen ion molar concentration
pH+pOH=14 тАФ Relationship between pH and pOH at 25┬░C
The pH value is calculated as the negative logarithm of the hydrogen ion concentration. A pH of 7 represents a neutral solution, while values less than 7 indicate acidity (higher [H+] concentration) and values greater than 7 indicate basicity (lower [H+] concentration/higher [OHтИТ] concentration). The scale typically ranges from 0 to 14.
pH < 7 indicates an acidic solution.
pH = 7 indicates a neutral solution (e.g., pure water).
pH > 7 indicates a basic (alkaline) solution.
Provides a simple numerical value for chemical intensity.
Essential for biological and industrial processes.
Does not measure total concentration of acids/bases, only active hydrogen ions.
Blood chemistry monitoring (normal range 7.35тАУ7.45).
Soil quality testing for agriculture.
The 'p' in pH stands for 'potenz' (German for power) or 'potential'.
Option A (pollution) is incorrect as pH is a chemical property, not a pollution metric. Option C and D (density, volume) are physical properties unrelated to the chemical hydrogen ion activity.
B is correct тАФ The pH scale is specifically designed to quantify the acidity or basicity of an aqueous solution.
Always remember that the pH scale is logarithmic; a change of 1 unit in pH corresponds to a 10-fold change in [H+] concentration.
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