What is the ph after 0.195 mol of naoh is added to the buffer from part a? assume no volume change on the addition of the base?

pH after addition of NaOH = 6.364

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.

The buffer solution can be acidic or basic

• Acid buffer solutions consist of weak acids and their salts.

valence according to the amount of salt anion

• Alkaline buffer solution consists of a weak base and its salt.

valence according to the amount of salt cation

• If the buffer solution is acidic then

a slight addition of acid (H⁺) will be balanced by the conjugate base

the addition of a small base (OH⁻) will be balanced by the weak acid

• If the buffer solution is alkaline then

the addition of a little acid (H⁺) will be balanced weak base

the addition of a small base (OH⁻) will be balanced

the weak acid HA and NaA, including Acid buffer solution

the addition of a small base (OH⁻) will be balanced by the weak acid

Part A: What is the pH of a buffer prepared by adding 0.809 moles of the weak acid HA to 0.609 moles of NaAin 2.00 L of solution? The dissociation constant Ka of HA is 5.66×10−7

The ph after 0.195 mol of naoh is added to the buffer from part A:

Reactions that occur:

HA      + NaOH ---> NaA + H2O

0.809     0.195        0.609

0.195       0.195        0.195

0.614       0               0.804

pH scale

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solution has the lowest ph

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Keywords : buffer, acid, salt, pH

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