The pH of a sample of gastric juice in a person's stomach is...

The $\mathrm{pH}$ of a sample of gastric juice in a person's stomach is
2.1. Calculate the pOH, $\left[\mathrm{H}^{+}\right],$ and $\left[\mathrm{OH}^{-}\right]$ for this sample. Is gastric juice acidic or basic?

Key Concepts

Acidity and Basicity

Acidity and basicity describe the chemical nature of a solution. A solution with a pH less than 7 is considered acidic due to a high concentration of hydrogen ions, whereas a solution with a pH greater than 7 is deemed basic because it has a higher concentration of hydroxide ions. This concept is central in understanding the behavior of various chemical and biological systems.

Calculation of Ion Concentrations

The ion concentrations in a solution can be calculated using the equations [H?] = 10^(-pH) and [OH?] = 10^(-pOH). These calculations leverage the logarithmic nature of the pH and pOH scales in order to deduce the molar concentrations of the ions present in the solution.

pH Scale

The pH scale is a logarithmic measure of the hydrogen ion concentration in a solution. It indicates how acidic or basic a solution is, with lower pH values corresponding to higher hydrogen ion concentrations (more acidic) and higher pH values corresponding to lower hydrogen ion concentrations (more basic).

pOH Scale

The pOH scale is the logarithmic measure of the hydroxide ion concentration in a solution. It serves as a complementary scale to the pH scale in characterizing the basicity or acidity of a solution, where a lower pOH indicates higher hydroxide ion concentrations.

Relationship between pH and pOH

In aqueous solutions at 25°C, pH and pOH are interconnected by the equation: pH + pOH = 14. This fundamental relationship arises from the autoionization equilibrium of water and is crucial for converting between the hydrogen ion concentration and the hydroxide ion concentration.

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