Fundamental Inorganic Chemistry Quiz

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Questions and Answers

What describes the relationship between pKa and acid strength?

  • The concentration of the acid solution determines strength.
  • Stronger acids have lower pKa values. (correct)
  • Higher pKa values indicate stronger acids.
  • Acids with pKa values below 0 are classified as weak.

What happens to the phosphate buffer equilibrium if H3O+ concentration increases?

  • The concentration of H2PO4- decreases. (correct)
  • The pH of the buffer solution increases.
  • The equilibrium shifts to produce more HPO4 2-.
  • H3O+ concentration remains constant.

What is the primary measure that pH represents in solution?

  • The hydronium ion concentration. (correct)
  • The overall molecular concentration of the solution.
  • The concentration of hydroxide ions.
  • The total number of water molecules present.

Which of the following statements about strong and weak acids is true?

<p>Weak acids have higher pKa values than strong acids. (A)</p> Signup and view all the answers

At which pH level can aqueous solutions not exceed?

<p>pH 14 (C)</p> Signup and view all the answers

What are the positively charged ions called?

<p>Cations (B)</p> Signup and view all the answers

Which statement about salts is correct?

<p>Salts consist of two ions forming a neutral compound. (A)</p> Signup and view all the answers

What is the oxidation state of Iron in Iron (III) Sulphate?

<p>+3 (A)</p> Signup and view all the answers

What happens when an acid deprotonates?

<p>It loses a hydrogen ion. (D)</p> Signup and view all the answers

Which of the following compounds is an example of a polyprotic acid?

<p>Acetic Acid (B)</p> Signup and view all the answers

What is formed when hydrochloric acid ionizes in water?

<p>H3O+ and Cl- (A)</p> Signup and view all the answers

What is the relationship between anions and their conjugate acids?

<p>Anions are created when acids donate protons. (A)</p> Signup and view all the answers

Which of the following is a correct name for FeSO4?

<p>Iron (II) Sulphate (D)</p> Signup and view all the answers

What is the implication of acetic acid having a pK of 4.756?

<p>At pH 4.756, there are equal concentrations of acetic acid and acetate. (C)</p> Signup and view all the answers

Which compound predominantly exists at physiological pH (7.2) when considering succinic acid?

<p>Succinic anion (C)</p> Signup and view all the answers

How does the Brønsted-Lowry definition categorize acids and bases?

<p>Acids donate protons and bases accept protons. (C)</p> Signup and view all the answers

What happens to water at a neutral pH of 7?

<p>It can act as both an acid and a base. (D)</p> Signup and view all the answers

Which statement about the deprotonization of acids is true?

<p>It varies with pH levels. (C)</p> Signup and view all the answers

What defines the conjugate base of acetic acid?

<p>Acetate ion. (C)</p> Signup and view all the answers

What is the relationship between sulfuric acid and its ionized forms?

<p>Both bisulfate and sulfate ions can exist in solution. (C)</p> Signup and view all the answers

Which statement best describes the formation of ammonium ions?

<p>Ammonium is formed when ammonia accepts a proton. (A)</p> Signup and view all the answers

Flashcards

What is inorganic chemistry?

The study of the chemical properties and reactions of all elements except carbon, as well as carbon-based molecules that are less reduced than carbon dioxide.

What is a salt?

A compound formed by the electrostatic attraction between two oppositely charged ions, typically resulting in a crystalline solid.

What is an ion?

An atom that carries a net electrical charge due to the gain or loss of electrons.

What is a cation?

A positively charged ion formed by the loss of electrons from an atom.

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What is an anion?

A negatively charged ion formed by the gain of electrons to an atom.

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What is ionization?

The process of an acid losing a hydrogen ion (H+).

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What is a polyprotic acid?

An acid that can donate more than one proton (H+).

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What is a sodium salt of an organic acid?

The salt formed when an organic acid reacts with a base.

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pKa

The pH value at which 50% of a solution is in the acidic form (HA) and 50% is in the conjugate base form (A-)

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Acid Dissociation

The reaction of an acid with water to form a hydronium ion (H3O+) and the conjugate base of the acid.

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Conjugate Base

The species that remains after an acid has donated a proton. It is the deprotonated form of the acid.

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Base Dissociation

The reaction of a base with water to form a hydroxide ion (OH-) and the conjugate acid of the base.

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Conjugate Acid

The species that is formed when a base accepts a proton. It has one more proton than the base.

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Brønsted-Lowry Acid

A chemical species that can donate a proton (H+).

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Brønsted-Lowry Base

A chemical species that can accept a proton (H+).

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Lewis Acid-Base Theory

A model of acid-base interactions that describes acids as electron-pair acceptors and bases as electron-pair donors.

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What is pH?

A measure of the concentration of hydronium ions (H3O+) in a solution, represented by the formula pH = -log10[H+], where [H+] represents the molar concentration of hydrogen ions.

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What is a pH buffer?

A solution's pH does not change significantly even if there are changes in the concentration of hydronium ions (H3O+). This is achieved by the presence of a weak acid and its conjugate base, which act as a buffer system to resist pH changes.

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What determines the strength of an acid?

The strength of an acid is determined by its pKa, which reflects how readily it releases a proton (H+). Strong acids have a pKa below 0, easily dissociating in solution. Weak acids have a pKa above 0, dissociating less readily.

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What is the autoionization of water?

The equilibrium reaction of water, where water molecules donate and accept protons, resulting in the formation of hydronium ions (H3O+) and hydroxide ions (OH-).

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Why are there limits to the pH scale?

Aqueous solutions (water-based) cannot have a pH above 14, but can reach negative pH values. This is because the pH scale is logarithmic, so there are no values beyond the limits.

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Study Notes

Fundamental Inorganic Chemistry

  • Inorganic chemistry studies non-carbon-based compounds and carbon compounds less oxidized than carbon dioxide.
  • Yellow is a color found in all living organisms.
  • Salts are formed from two ions.
  • Ions are atoms with a positive or negative electric charge.
  • Cations are positively charged ions.
  • Anions are negatively charged ions.
  • The charge of an ion is its valence.
  • A 2+ ion is a divalent cation, a 3- ion is a trivalent anion.
  • Salt names consist of the cation first, then the anion.
  • Examples include Sodium Chloride and Potassium Nitrate.
  • Some cations are formed from their conjugate bases. Ammonia (NH3), for example, forms Ammonium (NH4+).
  • Oxidation state of a cation (like Iron) is indicated using Roman numerals. Iron(II) Sulphate is FeSO4; Iron(III) Sulphate is Fe2(SO4).

Acids

  • Acids deprotonate (lose hydrogen ions) when they ionize or deprotonate.
  • HCl + H2O → H3O+ + Cl- (shorthand: HCl → H+ + Cl-)
  • Polyprotic acids have more than one proton to lose, which creates a wide range of anions with varying pH values.
  • Organic acids work similarly. Acetic acid (CH3COOH), for example, forms acetate (CH3COO-) and H3O+.

Acids and Bases

  • Multiple definitions exist for acids and bases.
    • Arrhenius: Acids form H3O+ ions; bases form OH- ions.
    • Brønsted-Lowry: Acids donate H+ ions; bases accept H+ ions.
    • Lewis: Acids donate electron pairs; bases accept electron pairs.
  • Water has a neutral pH (7) and reacts with itself (forming H3O+ and OH-).
  • Acidic solutions (pH < 7) have more H3O+ than OH-.
  • Basic/Alkaline solutions (pH > 7) have more OH- than H3O+.
  • pH measures H3O+ concentration (pH = -log10[H+]).

Strong and Weak Acids

  • Acid strength depends on pKa. A lower pKa indicates a stronger acid.
  • Organic acids are always weak acids.
  • Hydrochloric and Nitric acids are strong acids.
  • Nitrous acid and Acetic acid are weak acids.

Buffers

  • Buffers maintain a narrow pH range around a pKa value, preventing drastic pH changes.
  • Phosphate buffers, for example, are used at physiological pH (7.2) to prevent pH changes.

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