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What are the largest sources of error in this experiment (Determination of the Dissociation Constant (Ka)...

What are the largest sources of error in this experiment (Determination of the Dissociation Constant (Ka) of a Weak Acid ) ?( lab report question please need the full answer)

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Answer #1

The dissociation constant of weak acid is usually calculated by measuring the pH of the soution of weak acid.

A potential error source comes from pH meter. pH gives the concentration of H+ dissociated from the weak acid. If the pH meter reading is not accurate then the calculated value of Ka is not accurate. Higher pH reading will give lower Ka value than actual.

If the concentration of weak acid is not fixed correctly, then also it gives error in ka determination.

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