Calcule el pH de las siguientes disoluciones de ácidos...

Calcule el $\mathrm{pH}$ de las siguientes disoluciones de ácidos fuertes: (a) $\mathrm{HBr} 8.5 \times 10^{-3} \mathrm{M}$; (b) $1.52 \mathrm{~g}$ de $\mathrm{HNO}_3$ en $575 \mathrm{~mL}$ de disolución; (c) $5.00 \mathrm{~mL}$ de $\mathrm{HClO}_4 \quad 0.250 \mathrm{M}$ diluidos a $50.0 \mathrm{~mL}$; (d) una disolución preparada por la mezcla de $10.0 \mathrm{~mL}$ de $\mathrm{HBr} 0.100 \mathrm{M}$ con $20.0 \mathrm{~mL}$ de $\mathrm{HCl} 0.200 \mathrm{M}$.

Key Concepts

pH Calculation

This concept involves using the definition of pH as the negative logarithm of the hydrogen ion concentration, expressed as pH = -log[H?]. In the context of acid solutions, this formula allows us to determine the acidity of a solution based on the molar concentration of hydrogen ions present.

Strong Acid Dissociation

Strong acids are those that completely ionize in solution, meaning that their dissociation in water is essentially 100% efficient. This implies that for any strong acid, the concentration of hydrogen ions [H?] is equal to the initial concentration of the acid, simplifying the pH calculation.

Molarity and Mole Calculations

Molarity is defined as the number of moles of solute per liter of solution, which is useful for quantifying concentrations in chemical reactions and solutions. Calculations often require converting a given mass of a substance to moles using its molar mass, and then determining its concentration in a given volume of solution.

Dilution Principles

When a solution is diluted, its concentration decreases in proportion to the increase in volume. This principle is frequently applied using the equation C?V? = C?V?, which helps determine the new concentration after dilution or when combining solutions with different volumes.

Mixing Multiple Solutions

Mixing solutions involves combining the individual amounts of solute (typically measured in moles) from each solution to find the total moles present. The overall concentration is then determined by dividing the total moles of solute by the final total volume of the mixed solution, an approach that is crucial when dealing with mixtures of acid solutions.

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