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rmarsino
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Homework Statement
What is the pH after 12.50 mL of 0.10 M NaOH has been added to 25.00 mL of 0.10 M acetic acid?
Homework Equations
The Attempt at a Solution
i have no idea how to do this.
Borek said:Once you know what buffer is, and once you realize what is molar ratio of both reactants, you don't need any calculations to find out the answer.
Borek
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pH calculator & buffer calculator
symbolipoint said:Maybe this really IS a buffer solution, being half the moles are the salt and half the moles are the acetic acid. There is a simple way to find pH of this buffer using pK value, right?
The pH of a solution is a measure of its acidity or basicity. Knowing the pH of a NaOH + Acetic Acid mixture can help determine the concentration of each component and how they will react with other substances.
The pH of a solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where pKa is the acid dissociation constant and [A-] and [HA] are the concentrations of the conjugate base and acid, respectively. In this case, [A-] would be the concentration of the acetate ion and [HA] would be the concentration of acetic acid.
The pKa value of acetic acid is 4.76.
If the concentrations of NaOH and acetic acid are equal, the resulting pH of the mixture would be equal to the pKa value of acetic acid, which is 4.76.
To prepare a mixture with a specific pH, you would need to use the Henderson-Hasselbalch equation to calculate the required concentration of each component. For example, if you wanted a pH of 6, you would need to use a higher concentration of acetic acid compared to NaOH.