Finding Ka (AQA A-Level Chemistry): Quizzes

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Finding Ka
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At the half-equivalence point, what relationship exists between pH and pKapK_a?

pH equals pKapK_a

At the half-equivalence point, what is true about [HA][HA] and [A−][A^-]?

[HA][HA] equals [A−][A^-]

Which formula is used to calculate KaK_a from pH at the half-equivalence point?

Ka=10−pHK_a = 10^{-\text{pH}}

What colour change does phenolphthalein show at the end-point?

Colourless to pink

Which pH values are typically used to calibrate the pH meter?

pH 4.00, 7.00, and 10.00

What volume of ethanoic acid is transferred using the pipette?

25.0 cm³

What is the KaK_a value calculated from a pH of 4.75?

1.8×10−51.8 \times 10^{-5} mol dm⁻³

How do you find the volume for the half-equivalence point?

Use half the NaOH volume for equivalence

What is the typical KaK_a range for weak acids like ethanoic acid?

Around 10−510^{-5} mol dm⁻³

What was the specimen pH measured at the half-equivalence point?

4.75

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