I think I'm getting these now. So as you are adding titrant (for a strong acid/weak base OR weak acid/strong base titration): [1] Before you reach the equivalence point, you have to use the Henderson-Hasslebach Equation to find the pH. [2] Once you reach the half equivalence point, pH is just equal to pKa (found by using the Henderson-Hasslebach Equation). [3] Once you reach the equivalence point you DO NOT use the Henderson-Hasslebach Equation, rather, you find the concentration of either your conjugate acid or conjugate base (depending on the titration type) to find the pH. [4] Once you exceed the equivalence point, you calculate the concentration of the strongest acid in your reaction to find the pH (or, depending on your titration type, you calculate the concentration of the strongest base in your reaction to find the pOH and then find the pH). Summary: - Before you reach the equivalence point, use the Henderson-Hasslebach Equation to find the pH. - Once you reach or exceed the equivalence DO NOT use the the Henderson-Hasslebach Equation to find the pH.
hi, but what if the stoichiometric coefficients are not all one, will it be fine that the moles of the reactants after the change is not zero, hence, using henderson-hasslebach equation?
i guess its better to think that if there is any acid or base with their conjugate one You can use Hasslebach Formula. But in the other cases we already have acids or bases alone so you dont need to use Hasslebach formula. İf there are Strong ACİD and Weak ACİD together or Strong BASE and Weak BASE together you can ignore the weak one ;))
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I think I'm getting these now. So as you are adding titrant (for a strong acid/weak base OR weak acid/strong base titration):
[1] Before you reach the equivalence point, you have to use the Henderson-Hasslebach Equation to find the pH.
[2] Once you reach the half equivalence point, pH is just equal to pKa (found by using the Henderson-Hasslebach Equation).
[3] Once you reach the equivalence point you DO NOT use the Henderson-Hasslebach Equation, rather, you find the concentration of either your conjugate acid or conjugate base (depending on the titration type) to find the pH.
[4] Once you exceed the equivalence point, you calculate the concentration of the strongest acid in your reaction to find the pH (or, depending on your titration type, you calculate the concentration of the strongest base in your reaction to find the pOH and then find the pH).
Summary:
- Before you reach the equivalence point, use the Henderson-Hasslebach Equation to find the pH.
- Once you reach or exceed the equivalence DO NOT use the the Henderson-Hasslebach Equation to find the pH.
hi, but what if the stoichiometric coefficients are not all one, will it be fine that the moles of the reactants after the change is not zero, hence, using henderson-hasslebach equation?
i guess its better to think that if there is any acid or base with their conjugate one You can use Hasslebach Formula. But in the other cases we already have acids or bases alone so you dont need to use Hasslebach formula. İf there are Strong ACİD and Weak ACİD together or Strong BASE and Weak BASE together you can ignore the weak one ;))
So appreciate the series of these videos, this has helped me tremendously.
Best youtube series!!
Thanks!
bravo