Acid-Base Reactions and Titrations Quiz

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Questions and Answers

Why is it crucial to rinse the pipette with the base solution before titration?

To ensure the pipette is completely dry.

To increase the concentration of the base in the pipette.

To prevent the base solution from reacting with water, hindering accurate measurements.

To avoid diluting the base solution with residual water from previous cleaning. (correct)

What is the primary reason for avoiding rinsing the conical flask with the base solution during titration?

To ensure precise measurement of the solution, as it will be over diluted.

To prevent contamination of the solution.

To maintain the original concentration of the base solution.

To prevent using more base solution than necessary, which could lead to inaccurate results. (correct)

Why is it essential to remove air bubbles from the burette or pipette before starting a titration?

To avoid excess pressure buildup in the apparatus from air bubbles.

To ensure that the actual volume of the solution delivered is consistent with the burette reading, and no air gap is considered in its place. (correct)

To prevent the solution from splashing during the process.

To enhance the color change of the indicator for a clearer endpoint.

Why is it important to read the burette to two decimal places during titration?

To ensure consistency and accuracy in volume measurements. (D) Signup and view all the answers

What is the consequence of blowing out the last drop of solution from the tip of a pipette?

It leads to using more solution than the pipette was designed to deliver. (B) Signup and view all the answers

What is the significance of clamping the burette in a vertical position during a titration?

To avoid any parallax error when noting the meniscus reading, thus ensuring correct measurement. (B) Signup and view all the answers

Which of the following is NOT a primary use of acid-base titrations?

To determine the rate of reaction between an acid and a base. (A) Signup and view all the answers

In the context of reactions, what term accurately describes a reaction that involves an exchange of parts between two reacting compounds?

Metathesis reaction (D) Signup and view all the answers

Which statement best describes the role of a buffer solution?

It resists a change in pH upon addition of a small amount of strong acid or base. (C) Signup and view all the answers

Which of the following mixtures would create an alkaline buffer?

Aqueous mixture of ammonia solution and ammonium chloride. (B) Signup and view all the answers

Why is it critical to choose the correct indicator for an acid-base titration?

To ensure the color change occurs at the equivalence point of the titration. (D) Signup and view all the answers

Based on the provided table, which indicator is most suitable for a titration involving a strong acid and a weak base?

Methyl orange (D) Signup and view all the answers

When performing a titration, why should the burette be rinsed with the solution being used in it?

To remove any traces of previous solutions and avoid dilution with water. (A) Signup and view all the answers

A titration involving ethanoic acid and ammonia requires which of the following?

A pH meter is required as no suitable indicator is available. (C) Signup and view all the answers

Which of these scenarios requires the use of a buffer solution?

Maintaining a stable pH for enzymatic reactions in a biological system. (B) Signup and view all the answers

At what pH does Phenolphthalein change from its colorless form to its pink form?

Around 9 (B) Signup and view all the answers

In an acid-base titration, at the equivalence point, which relationship is accurate concerning the moles of reactants?

The moles of $H^+$ ions are equal to the moles of $OH^-$ ions. (D) Signup and view all the answers

What is the primary purpose of an indicator in acid-base titrations?

To signal the end point of the titration through a visible color change. (C) Signup and view all the answers

What differentiates the end point from the equivalence point in an acid-base titration?

The equivalence point occurs when the reaction is complete, while the end point is marked by a change in indicator color. (D) Signup and view all the answers

What type of organic substances are used as acid-base indicators?

Weak organic acids or bases that partially dissociate in solution. (B) Signup and view all the answers

A solution in a titration has a pH of 5.0. Considering the provided indicators in the table, what would be the most suitable indicator to use for this titration?

Methyl red because its transition range is around pH 5.0. (D) Signup and view all the answers

What is the fundamental chemical process that occurs in an acid-base (neutralization) reaction?

A transfer of a proton ($H^+$) between reactants. (D) Signup and view all the answers

Which of the following is NOT considered a main aspect of volumetric analysis, based on the text?

Spectrophotometric analysis (D) Signup and view all the answers

During an acid-base titration, the indicator changes color due to:

A tiny excess of hydroxide ions, resulting in a basic color. (C) Signup and view all the answers

Flashcards

Buffer Solution

A solution that resists pH changes when small amounts of acid or base are added.

Acid Buffer

A buffer made from a weak acid and its salt that maintains acidic pH.