Answer :
Final answer:
A buffer solution is used to resist changes in pH. The pH of the buffer after adding 0.300 mol of H+ can be calculated using the Henderson-Hasselbalch equation.
Explanation:
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added. In this case, the (CH3)2NH₂ and (CH3)NH are part of a buffer solution. The (CH3)2NH₂ acts as a weak base and (CH3)NH acts as its conjugate acid.
To calculate the pH of the buffer after adding 0.300 mol of H+, we need to consider the chemical reaction:
(CH3)2NH₂ + H+ ⇌ (CH3)NH₂ + H2O
Since we're adding 0.300 mol of H+, we expect the reaction to shift to the right, consuming some of the (CH3)2NH₂ and producing (CH3)NH₂. The remaining (CH3)2NH₂ and (CH3)NH will then generate a specific pH based on their concentrations.
To find the pH, concentration of (CH3)2NH₂, and concentration of (CH3)NH, we need to use the given mass (35.9 g) and volume (250.0 mL) of (CH3)2NH₂, as well as the molarity of (CH3)NH (1.42 M). From there, we can calculate the pH using the Henderson-Hasselbalch equation.
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