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Is buffer capacity the same if determined by titration with a strong base instead of a strong acid?
It depends a bit on the buffer itself, but it is usually true. Generally speaking, a buffer is a solution composed of a weak acid (or base) along with its conjugate base (or acid). Usually, the two components (let's call the HA and A- for a weak acid and its conjugate base) are added in equal concentrations. If this is the case, then it is also true that the pH of the solution is equal to the pKa of the weak acid, a very useful fact. If the concentration of two HA and A- are equal, then the buffer capacity should be the same using a strong acid or strong base. However, you can also make a buffer with unequal concentrations of HA and A-. This is still considered a buffer solution, and it will resist change to pH in both directions, but unequally now. If you have a higher concentration of HA than A-, then the buffer will have a higher capacity to resist pH change if you add a strong base (because the base will be deprotonating HA, which you have more of). If you added a strong acid instead, then you would protonate all the A- faster (than you would deprotonate HA with the same amount of strong base), and so it would have a lower buffer capacity. This discussion works equally well if you are using a weak base (B) and its conjugate acid (HB+) instead, except everything is switched!
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RossNo, the buffer capacity would not be the same if determined by titration with a strong base instead of a strong acid. Buffer capacity is the ability of a buffer solution to resist changes in pH upon addition of an acid or a base. The capacity depends on the components of the buffer system and their relative concentrations.
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Why potentiometric titration curves are s-shaped?
Potentiometric titration curves are s-shaped due to the buffering capacity of the solution. At the beginning of the titration, minimal change in pH occurs as the solution acts as a buffer, resisting pH changes. Once the buffer region is overcome, the titration curve becomes steeper as the solution approaches the equivalence point.
What is role of buffer solution in complexometric titration?
In complexometric titration, a buffer solution is used to maintain a constant pH throughout the titration process. This helps to ensure that the conditions are optimal for the formation of the metal-complex, leading to more accurate and reliable results. The buffer also helps to minimize the effect of changes in pH on the endpoint of the titration.
Why you have to add buffer before titration with EDTA?
Adding a buffer solution before titration with EDTA helps to maintain a constant pH which is crucial for the formation of metal-EDTA complexes. The buffer solution prevents any fluctuations in pH that could affect the accuracy and precision of the titration results.
What is buffer solution in titration?
A buffer solution in titration helps maintain a relatively constant pH during the titration process. It is composed of a weak acid and its conjugate base (or a weak base and its conjugate acid). This helps prevent large changes in pH that could affect the accuracy of the titration.
How can one determine the buffer capacity of a solution?
Buffer capacity of a solution can be determined by measuring the amount of acid or base that can be added to the solution before the pH changes significantly. It is calculated by dividing the amount of added acid or base by the resulting change in pH. A higher buffer capacity indicates the solution can resist changes in pH more effectively.
