Skip to main content
Ch.17 - Applications of Aqueous Equilibria
Chapter 17, Problem 44a

The following pictures represent solutions at various stages in the titration of sulfuric acid H2A (A2- = SO4 2-) with aqueous NaOH. (Na+ ions and water molecules have been omitted for clarity.)
Illustration of sulfuric acid titration stages with NaOH, showing molecular interactions.
. (a) To which of the following stages do solutions 1–4 correspond? (i) Halfway to the first equivalence point (ii) Halfway between the first and second equivalence points (iii) At the second equivalence point (iv) Beyond the second equivalence point

Verified Solution

Video duration:
12m
This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Titration

Titration is a quantitative analytical technique used to determine the concentration of a solute in a solution. It involves the gradual addition of a titrant (a solution of known concentration) to a sample solution until a reaction reaches its endpoint, often indicated by a color change. In this case, sulfuric acid (H2A) is being titrated with sodium hydroxide (NaOH), which is a strong base.
Recommended video:
Guided course
03:04
Acid-Base Titration

Equivalence Point

The equivalence point in a titration is the stage at which the amount of titrant added is stoichiometrically equivalent to the amount of substance in the sample solution. For sulfuric acid titrated with NaOH, there are two equivalence points due to the diprotic nature of sulfuric acid, meaning it can donate two protons (H+ ions) during the reaction. Understanding the equivalence points is crucial for determining the stages of the titration.
Recommended video:
Guided course
01:07
At the Equivalence Point

Halfway to Equivalence Point

The halfway to the equivalence point refers to the stage in a titration where half of the acid has been neutralized by the base. At this point, the concentrations of the weak acid and its conjugate base are equal, which is significant for calculating pH and understanding buffer systems. In the context of the titration of sulfuric acid, identifying this stage helps in predicting the pH changes and the behavior of the solution as titration progresses.
Recommended video:
Guided course
01:07
At the Equivalence Point
Related Practice
Textbook Question

The following pictures represent solutions at various stages in the titration of a weak base B with aqueous HCl. (Cl- ions and solvent water molecules have been omitted for clarity.)

. (a) To which of the following stages do solutions 1–4 correspond? (i) The initial solution before addition of any HCl (ii) Halfway to the equivalence point (iii) At the equivalence point (iv) Beyond the equivalence point

809
views
Textbook Question

The following pictures represent solutions at various stages in the titration of a weak base B with aqueous HCl. (Cl- ions and solvent water molecules have been omitted for clarity.)

. (b) Is the pH at the equivalence point more or less than 7?

595
views
Textbook Question
The following pictures represent solutions at various stages in the titration of a weak diprotic acid H2A with aqueous NaOH. (Na+ ions and water molecules have been omitted for clarity.)

. (b) Which solution has the highest pH? Which has the lowest pH?
376
views
Textbook Question

The following pictures represent solutions at various stages in the titration of sulfuric acid H2A (A2- = SO4 2-) with aqueous NaOH. (Na+ ions and water molecules have been omitted for clarity.)

. (b) Which solution has the highest pH? Draw a picture that represents the solution prior to addition of any NaOH.

403
views
Textbook Question

The following pictures represent solutions of Ag2CrO4, which also may contain ions other than Ag+ and CrO42- that are not shown. Solution 1 is in equilibrium with solid Ag2CrO4. Will a precipitate of solid Ag2CrO4 form in solutions 2-4? Explain.

(1) (2) (3) (4)

582
views
1
rank
Textbook Question
Is the pH greater than, equal to, or less than 7 after the neutralization of each of the following pairs of acids and bases? (c) HBr and aniline (C6H5NH2)
500
views