Can the pH of a solution be negative? Explain.

Short Answer

Expert verified
Yes, the pH of a solution can be negative. This occurs in extremely acidic solutions with exceptionally high hydrogen ion concentrations (\([H^+]\)) which result in a negative logarithm value in the pH formula (pH = -log10[H+]). Though unusual, negative pH values represent a higher acidity level than solutions with pH close to 0.

Step by step solution

01

Basic pH Concept

The pH is a measure of the acidity or alkalinity of a solution. It is calculated using the formula: pH = -log10[H+] where [H+] is the concentration of hydrogen ions (in moles per liter) in the solution. A pH value of 7 is considered neutral, while a pH less than 7 is acidic and a pH greater than 7 is basic (alkaline).
02

Negative pH and the Formula

Since pH is calculated using the formula pH = -log10[H+], a negative pH would indicate a large hydrogen ion concentration, as the negative logarithm of a value greater than 1 will be a negative number. Thus, higher [H+] values will lead to more negative pH values.
03

Acidic Solution and High Hydrogen Ion Concentration

A solution with a high hydrogen ion concentration is considered very acidic. In extreme cases, the concentration may be so high that it results in a negative pH value. While unusual, negative pH values can occur in extremely acidic solutions.
04

Concluding Statement

To conclude, it is possible for the pH of a solution to be negative, albeit in very extreme cases where the hydrogen ion concentration is exceptionally high. This implies a highly acidic solution, representing a greater level of acidity than solutions with pH close to 0.

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