True or false, at 25 degrees celsius H+ ion concentration in pure water is 7 x 10^ -7 mole per liter?
True. At 25 degrees Celsius, the H+ ion concentration in pure water is approximately 7 x 10^ -7 mole per liter.
To understand why this is true, we need to look at the concept of pH and the dissociation of water. In water, a small proportion of water molecules dissociate into hydrogen ions (H+) and hydroxide ions (OH-). This process can be represented by the equation:
H2O ↔ H+ + OH-
The concentration of H+ ions in water is a crucial aspect of the acidity or alkalinity of a solution and is measured using the pH scale. The pH scale ranges from 0 to 14, with 7 considered neutral. A pH lower than 7 indicates acidity, while a pH higher than 7 indicates alkalinity.
In pure water, the concentration of H+ and OH- ions are equal because water is neutral. Thus, the concentration of H+ ions is 10^-7 moles per liter, which is equivalent to 7 x 10^-7 mole per liter.
It is important to note that this value is an approximation because the actual concentration of H+ ions in pure water can vary slightly depending on factors such as temperature. Nonetheless, 7 x 10^-7 mole per liter is an often-used estimate for simplification purposes when referring to the H+ ion concentration in pure water at 25 degrees Celsius.