The pH at the half-equivalence point is 3.15 in an acid-base titration. What is the Ka...

The pH at the half-equivalence point is 3.15 in an acid-base titration. What is the Ka of the acid?

What are the components of an acid-base buffer? What do these buffers do?

Expert Solution

At half -equivalence point [A-] = [HA]

PH = PKa + log[A-]/[HA]

PH = PKa

At half -equivalence point PH = PKa

Pka = PH

PKa = 3.15

-logKa = 3.15

Ka = 10^-3.15 = 0.0007 = 7*10^-4 >>>>>answer

A solution which resists PH value by the addition of small amount of strong acid and strong base is called buffer solution.

They are two types

Acid buffer solution : Acid buffer solution is a mixture of weak acid and it's salt with strong base.

CH3COOH + CH3COONa

Basic buffer solution : Basic buffer solution is a mixture of weak base and it's salt with strong acid.

NH3 + NH4Cl

queen_honey_blossom answered 3 years ago

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