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The following figure represents solutions at various stages of the titration of a weak acid, HA, with NaOH. (The Na+ ions and water molecules have been omitted for clarity.) To which of the following regions of the titration curve does each drawing correspond: (a) before addition of NaOH, (b) after addition of NaOH but before the equivalence point, (c) at the equivalence point, (d) after the equivalence point?

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Irving Heathcote
Irving HeathcoteLv2
23 May 2020

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Related questions

The following pictures represent solutions at various points in the titration of a weak acid with aqueous . (ions and solvent water molecules have been omitted for clarity.)

Which picture corresponds to each of the following points in the titration?

a. Before the addition of any

b. Before the equivalence point

c. At the equivalence point

d. After the equivalence point

The following figure represents solutions that occur at various stages during the titration of a weak acid, HA, with NaOH. (The Na+ ions and water have been omitted for clarity.) Which of the following statements are true?

(i) The equivalence point is represented in (iv).

(ii) Both (i) and (ii) are buffer solutions.

(iii) The highest pH is represented by (ii).

A) statements (i) and (ii) are true.

B) only one statement is true.

C) all three statements are true.

D) statements (ii) and (iii) are true.

E) statements (i) and (iii) are true.

Consider a weak acid-strong base titration in which 25 mL of 0.120 M of acetic acid is titrated with 0.120 M of NaOH.

a) Calculate the pH of the acetic acid solution BEFORE addition of NaOH (pKa of acetic acid = 4.75).

b) Calculate the pH after the addition of 3.00 mL of NaOH.

c) Calculate the pH after the additon of 12.5 mL of NaOH. Notice that this is the half neutralizatiom point: some of the acetic acid molecules are converted to acetate ions producing a buffer whose pH depends on the base/acid ratio (CH3COO-/CH3COOH).

d) Calculate the pH after the addtion of 25 mL of NaOH (equivalence point).

e) Calculate the pH after the addition of 35 mL of NaOH.

f) suggest an indicator other then phenolphthalein that would be suitable for this titration and explain why.

Thank you very much.

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