buffer

1. 1what is a buffer?

   1. Aa buffer is anything that lessens the effect of a force.
   2. Bacid/base buffer is any solution that contains both a weak acid or base and its conjugate.
   3. Cbuffers are used to resist changes in pH.
2. 2define a buffer

   1. Aa buffer solution contains a weak acid mixed with its conjugate base
   2. Ba buffer is a strong acid mixed with a strong acid
   3. Ca buffer is a weak base and weak acid
3. 3how do buffers work?

   1. Awhen an acid is added, equilibrium shifts left
   2. Bwhen a base is added, equilibrium shifts right
   3. Cwhen an acid is added, equilibrium shifts right
   4. Dwhen a base id added, equilibrium shifts left
4. 4the requirements for a buffer:

   1. Amust be a mixture of weak acid and its salt or weak base and its salt.
   2. Ba buffer must contain relatively large concentrations of the weak acid to react with added base (OH-) and also must contain similar concentration of conjugate base to react with added acid (H+)
   3. Cthe acid and base components of the buffer must not consume each other in neutralization reaction.
5. 5true or false, a buffer capacity is a measure of the ability of a buffer to withstand pH changes

   1. AVerdadeiro
   2. BFalso
6. 6the higher the volume and concentration of the acid and base, the more

   1. AHA
   2. Bbuffer capacity
   3. CA
7. 7the closer the concentration of weak acid is to the concentration of conjugate base, the [blank_start]greater[blank_end] the buffering capacity.

   1. Aless
   2. Bgreater
8. 8True or false, a buffer whose pH= pKa has the highest buffer capacity.

   1. AVerdadeiro
   2. BFalso
9. 9features of the titration curve for a strong acid w/ strong base

   1. Athe pH of the solution begins at a low pH and slowly increases.
   2. Bthe pH suddenly increases when the moles of OH- nearly equals the moles of H30+
   3. Cthe pH increases slowly as the amount of OH- increases
10. 10characteristics of titration curve: weak acid with strong base

    1. Athe pH of the solution begins at a higher pH than a strong acid and slowly increases
    2. Ba buffer region is present before the pH jumps.
    3. Cthe pH increases slowly as the amount OH- increases
    4. Dthe equivalence point occurs above a pH of 7.0 because the Pr- acts as a weak base.

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Quiz sobre buffer, criado por May Du em 05-12-2021.

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May Du

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