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What will be the ph of a buffer solution containing an acid of pka7. 5, with an acid concentration exactly one fourth of that of the conjugate base?

Sagot :

The pH of a buffer solution containing acid of pKa 7.5 will be 8.1.

The pH of a solution indicates its acidity or basicity. A pH below 7 is acidic, while pH above 7 is basic. 7 is considered as the neutral value.

A buffer is a solution that has the ability to resist the change in pH when an acid or a base is added to it. The natural example of buffer is blood.

According to the question, pKa of acid = 7.5

If concentration of base is x then, concentration of acid will be x/4.

According to the Henderson–Hasselbalch equation,

pH = pKa + log [A⁻] / [HA]

pH = 7.5 + log [[tex]\frac{x}{x/4}[/tex]]

pH = 7.5 + log 4 ⇒ 7.5 + 0.602

pH = 8.1

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