Buffer solutions can be produced by mixing a weak acid with itsconjugate base or

Question

Buffer solutions can be produced by mixing a weak acid with itsconjugate base or by mixing a weak base with its conjugate acid.The Henderson-Hasselbalch equation, allows you to calculate the pH of a buffer. Note thatmolarity, moles, and millimoles are all proportional, so you cansubstitute the number moles, or millimoles, for the concentrationterms in this formula. 1)You need to produce a buffer solution that has a pH of 5.44.You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles ofacetate (the conjugate base of acetic acid) will you need to add tothis solution? The pk of acetic acid is 4.74. Express your answer numerically inmillimoles to three significant figures.

Explanation / Answer

PH = Pka + log [base]/[acid] acid = 10.0 mmol PH = 5.44; PKa = 4.74 assume mmol of acetate is x substitute into formula ==> 5.44 = 4.74 + log(x/10.0) ==> x = mmolof acetate = 50.1 mmol

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