Calculate the pH of a 200 mL solution of pure water to which...

Key Concepts

Dilution Principle

Dilution involves reducing the concentration of a solute within a solution by increasing the volume of the solvent. In calculations, this is done by determining the total number of moles of the solute (in this case, hydrogen ions from the acid) and then dividing by the total volume of the mixed solution. Understanding dilution is essential when combining solutions of different volumes or concentrations.

Water Autoionization

Even pure water undergoes autoionization, a process where water molecules slightly dissociate into hydrogen ions (H+) and hydroxide ions (OH-), typically resulting in a concentration of about 1 × 10?? M at room temperature. This concept is important in acid-base chemistry because, in very dilute solutions, the autoionization contribution can become comparable to the concentration of added acids or bases.

pH and Its Calculation

pH is a measure of the acidity of a solution, calculated as the negative logarithm of the hydrogen ion concentration. It is a fundamental concept in acid-base chemistry and is used to quantify how acidic or basic a solution is, with lower pH values indicating higher acidity.

Strong Acid Dissociation

Strong acids, such as HCl, are characterized by their complete dissociation in water, meaning that each molecule of a strong acid releases one or more hydrogen ions into the solution. This property simplifies the calculation of the hydrogen ion concentration because the amount of dissociated acid directly provides the concentration of H+ in the solution.

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