Comprehensive Acid-Base Chemistry: Definitions, Theories, and Titration Concepts

What is a common property of acids?

They taste sour and are conductive of electricity.

What is a common property of bases?

They taste bitter and are also conductive of electricity.

What is the simplest definition of an Arrhenius acid?

Molecules that produce hydrogen ions (H+) in solution.

What is the simplest definition of an Arrhenius base?

Molecules that produce hydroxide ions (OH-) in solution.

What is a major weakness of the Arrhenius model?

It cannot explain bases like NH3 that do not have an OH- attached.

According to Bronsted-Lowry theory, what is an acid?

A proton donor.

According to Bronsted-Lowry theory, what is a base?

A proton acceptor.

What is the significance of hydronium (H3O+) in aqueous solutions?

H+ combines with water to form hydronium; they are used interchangeably.

What are conjugate acid/base pairs?

Acid-base pairs where one can donate or accept a proton to become the other.

What is amphoterism?

The ability of a molecule to act as both an acid and a base.

What is the definition of acid strength?

The ability of an acid molecule to dissociate into ions in aqueous solution.

Name one strong acid.

Hydrochloric acid (HCl).

What characterizes weak acids?

They do not completely dissociate into ions in solution.

What is a common weak acid?

Acetic acid (CH3COOH).

What defines a strong base?

Strong bases completely dissociate into ions in solution.

Name one strong base.

Sodium hydroxide (NaOH).

What is the relationship between acid strength and conjugate base strength?

As acid strength decreases, conjugate base strength increases.

What is the autoionization of water?

The process where water dissociates into H+ and OH- ions.

What is the autoionization constant of water (Kw) at 25 °C?

1 × 10^-14.

What does a small Kw value indicate?

The reverse reaction is heavily favored, indicating limited autoionization.

What is the concentration of hydronium in pure water?

1 × 10^-7 M.

How can you determine if a solution is acidic or basic?

By comparing the concentrations of hydronium and hydroxide ions.

What happens to the concentration of hydroxide in an acidic solution?

It decreases as the concentration of hydronium increases.

What is a common use of ammonia (NH3)?

Used in floor cleaners and to make fertilizers.

What is the role of water in acid-base reactions?

Water can act as both an acid and a base, making it amphoteric.

What is the relationship between strong acids and their conjugate bases?

Strong acids have weak conjugate bases.

What is the significance of the lone pair of electrons in NH3?

It allows NH3 to accept a proton, acting as a base.

What is the effect of temperature on Kw?

Kw cannot change if temperature is constant.

What is the concentration of [H3O+] and [OH-] in a neutral solution?

[H3O+] = [OH-] = 1 × 10^-7 M

What characterizes an acidic solution?

[H3O+] > [OH-] and [H3O+] > 1 × 10^-7 M

What characterizes a basic solution?

[H3O+] < [OH-] and [OH-] > 1 × 10^-7 M

How is pH calculated?

pH = -log[H+]

What is the pH of neutral water?

7

What is the relationship between pH and pOH?

pKw = pH + pOH, where pKw = 14

What is a salt in chemistry?

An ionic compound formed from a metal or polyatomic cation and a nonmetal or polyatomic anion.

What is hydrolysis in the context of salts?

The reaction of ions with water, producing either hydroxide or hydronium.

What effect does the conjugate base of a weak acid have on pH?

It produces hydroxide, raising pH and making the solution basic.

What effect does the conjugate acid of a weak base have on pH?

It produces hydronium, lowering pH and making the solution acidic.

What is an indicator in chemistry?

An organic dye that changes color based on the pH of the solution.

What are the two forms of an indicator?

HIn (acid form) and In- (base form), which have different colors.

What is the significance of the pKa of an indicator?

It determines which form (acid or base) is dominant based on the pH.

What is litmus paper used for?

To test for acidic or basic solutions, with red turning blue in base and blue turning red in acid.

What is the purpose of a pH meter?

To provide accurate quantitative measurements of pH using a glass probe.

What is a neutralization reaction?

The reaction between an acid and a base producing a salt and water.

What is the final pH of a strong acid reacting with a weak base?

Final pH < 7 (acidic).

What is the equivalence point in titration?

The theoretical point at which the moles of titrant added are stoichiometrically equivalent to the moles of analyte.

What is the end point in titration?

The visual indication of the completion of a titration, often indicated by a dye.

What is a buret used for in titration?

To accurately dispense titrant with a stopcock for controlled flow.

What is the role of the analyte in titration?

The chemical being analyzed, whose concentration is usually unknown.

What is the role of the titrant in titration?

A well-characterized solution that reacts with the analyte.

What are examples of neutral salts?

NaCl, KI, LiNO3

What are examples of acidic salts?

NH4Cl

What are examples of basic salts?

RbF, NaHCO3

Strong Acids

HI, HBr, HCl, H2SO4, HNO3, HClO4

Strong Bases

hydroxides of group 1A and 2A metals