Chemistry Acids and Naming Conventions

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Acid

A molecule that contains hydrogen as its cation and one or more nonmetals as its anion, dissolved in water.

Binary Acid

Acids with only two elements, hydrogen and a nonmetal.

Oxyacid

Acids containing oxygen, hydrogen, and one or more nonmetals.

Hydro prefix

The prefix 'hydro' in an acid's name signals the lack of oxygen.

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Naming Oxyacids with -ate

Acids formed from polyatomic ions ending in '-ate' .

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Naming Oxyacids with -ite

Acids formed from polyatomic ions ending in '-ite'

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Acid Formula

A compound with hydrogen as the cation and one or more nonmetals as the anion.

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Binary Acid Nomenclature

A binary acid's name starts with 'hydro', followed by the nonmetal's root name, and ends with '-ic acid'

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Formation of Oxyacids

Oxyacids are formed by replacing the oxygen atoms in their corresponding polyatomic ions with hydrogen atoms.

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What is the key characteristic of acids?

An acid containing hydrogen as the cation and a nonmetal as the anion, dissolved in water.

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What are binary acids?

Binary acids contain two elements: hydrogen and a nonmetal. They are named using the prefix "hydro", the nonmetal's root name, and the suffix "ic acid."

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What are oxyacids?

A compound formed when a polyatomic ion containing oxygen is bonded to hydrogen and dissolved in water.

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How are oxyacids named if their corresponding polyatomic ion ends in "ate"?

If the polyatomic ion ends in "ate", the corresponding acid name ends in "ic acid".

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What is one characteristic of oxyacids?

They are acids that contain oxygen but are less common than other acids.

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What is hydrochloric acid and where is it found?

Hydrochloric acid (HCl(aq)) is a corrosive acid commonly found in the stomach.

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Why is saltwater not considered an acid?

Saltwater (NaCl(aq)) is simply salt dissolved in water. It does not contain hydrogen as a cation, so it's not an acid.

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What is hydrosulfuric acid?

Hydrosulfuric acid (Hâ‚‚S(aq)) is a colorless gas with a rotten egg smell, formed by dissolving hydrogen sulfide in water.

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What is phosphoric acid and where is it used?

Phosphoric acid (H₃PO₄(aq)) is a colorless, odorless liquid commonly used in fertilizers and detergents.

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What are some uses for sulfuric acid?

Sulfuric acid (Hâ‚‚SOâ‚„(aq)) is a strong acid with many industrial applications, like manufacturing fertilizers, explosives, and batteries.

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What is the main characteristic of an acid?

Acids are chemical compounds that contain hydrogen as a cation and one or more nonmetals as an anion. They must be dissolved in water to be considered acids (represented by "aq" in the chemical formula).

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What is a binary acid?

Binary acids contain hydrogen and one other non-metal atom. They are named using the prefix "hydro" followed by the non-metal's root name, and ending with "ic acid".

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What is an oxyacid?

Oxyacids contain hydrogen, oxygen, and at least one non-metal atom. Their names depend on the ending of the polyatomic ion.

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What is the naming rule for oxyacids with polyatomic ions ending in '-ate'?

If a polyatomic ion ends in "-ate", the corresponding acid name ends in "ic acid". For example, the polyatomic ion "phosphate", which ends in "-ate", forms phosphoric acid.

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What is the naming rule for oxyacids with polyatomic ions ending in '-ite'?

If a polyatomic ion ends in "-ite", the corresponding acid name ends in "ous acid". For example, the polyatomic ion "sulfite", which ends in "-ite", forms sulfurous acid.

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What is the fundamental difference between binary and oxyacids?

Binary acids contain no oxygen. For example, hydrochloric acid (HCl(aq)) is a binary acid.

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How can you distinguish a binary acid from an oxyacid by name?

Binary acid names start with "hydro", while oxyacid names do not. For example, hydrochloric acid is a binary acid with "hydro" in its name, while sulfuric acid is an oxyacid without "hydro" in its name.

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Are all compounds containing hydrogen acids?

Not all compounds containing hydrogen are acids. Water (Hâ‚‚O) is not an acid because it doesn't contain a nonmetal anion and isn't dissolved in water.

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What does the symbol 'aq' in a chemical formula indicate?

The "aq" in a chemical formula indicates that the compound is aqueous, meaning it is dissolved in water.

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Describe the elemental composition of binary acids and oxyacids.

Binary acids contain only two elements: hydrogen and a nonmetal. Oxyacids contain hydrogen, oxygen, and a nonmetal.

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What are acids?

Acids are chemical compounds that contain hydrogen as a cation (positively charged ion) and one or more nonmetals as anions (negatively charged ions). They must be dissolved in water to be considered acids. The 'aq' in the formula indicates that the compound is dissolved in water, meaning aqueous.

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How do you name oxyacids with '-ate' ending polyatomic ions?

If the polyatomic ion ends in '-ate', change it to '-ic acid'.

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How do you name oxyacids with '-ite' ending polyatomic ions?

If the polyatomic ion ends in '-ite', change it to '-ous acid'.

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What are some key points to remember when identifying acids?

All acids contain hydrogen. All acids must be dissolved in water. You can determine the formula of an acid by knowing the name of its polyatomic ion. Use the naming convention to determine the formula or name of an acid.

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What is the difference between hydrogen chloride and hydrochloric acid?

Hydrogen chloride (HCl) is the compound without water. Hydrochloric acid (HCl(aq)) is the compound dissolved in water, making it an acid. It's found in the stomach.

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What is phosphoric acid?

Phosphoric acid (H₃PO₄(aq)) is an oxyacid containing hydrogen, phosphorus, and oxygen dissolved in water.

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What is sulfuric acid?

Sulfuric acid (Hâ‚‚SOâ‚„(aq)) is an oxyacid containing hydrogen, sulfur, and oxygen dissolved in water.

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Study Notes

Acids

  • Acids are chemical compounds containing hydrogen as a cation and one or more nonmetals as an anion.
  • Acids must be dissolved in water to be classified as acids, denoted by "(aq)" after the chemical formula.
  • Acids are categorized as binary acids or oxyacids.
  • "Aq" stands for aqueous, meaning dissolved in water.
  • All acids contain hydrogen as its cation.
  • Acids are compounds that contain hydrogen as a cation (positively charged ion) and one or more nonmetals in the anion (negatively charged ion).

Binary Acids

  • Binary acids contain hydrogen and one other non-metal atom, dissolved in water.
  • Binary acid nomenclature always starts with "hydro", followed by the root of the nonmetal, and ends with "ic acid".
  • Hydrogen chloride (HCl) is a compound before dissolving in water.
  • Hydrochloric acid (HCl(aq)) is hydrogen chloride dissolved in water; a common stomach acid.
  • Hydrosulfuric acid (Hâ‚‚S(aq)) is formed when hydrogen sulfide is dissolved in water.
  • Binary acids contain two elements: hydrogen and a non-metal.
  • Hydrogen fluoride (HF) is the compound without water.
  • Hydrofluoric acid (HF(aq)) is the compound dissolved in water, making it an acid.
  • Hydrogen selenide (Hâ‚‚Se) is the compound without water.
  • Hydroselenic acid (Hâ‚‚Se(aq)) is the compound dissolved in water, making it an acid.
  • Hydrogen nitride (H₃N) is the compound without water.
  • Hydronitric acid (H₃N(aq)) is the compound dissolved in water, making it an acid.

Oxyacids

  • Oxyacids contain hydrogen, oxygen, and at least one non-metal atom.
  • Oxyacids are formed when a polyatomic ion containing oxygen (an oxyanion) is bonded to hydrogen and dissolved in water.
  • Oxyacids are named according to the polyatomic ion's ending.
    • If the polyatomic ion ends in "-ate", the acid name ends in "ic acid".
    • If the polyatomic ion ends in "-ite", the acid name ends in "ous acid".
  • Phosphoric acid (H₃POâ‚„(aq)) contains hydrogen, phosphorus, and oxygen dissolved in water.
  • Sulfuric acid (Hâ‚‚SOâ‚„(aq)) contains hydrogen, sulfur, and oxygen dissolved in water.
  • Carbonic acid (Hâ‚‚CO₃(aq)) contains hydrogen, carbon, and oxygen dissolved in water.
  • Oxyacids contain oxygen, hydrogen, and one or more nonmetals.

Naming Conventions

  • "Hydro" prefix in an acid name indicates the absence of oxygen.
  • Binary acids: "hydro" + non-metal root + "ic acid"
  • Oxyacids: Non-metal root + "ic acid" or "ous acid"
    • "-ate" polyatomic ion = "ic acid"
    • "-ite" polyatomic ion = "ous acid"

Differences Between Binary Acids and Oxyacids

  • Binary acids do not contain oxygen while oxyacids do.
  • Binary acid names start with "hydro", oxyacid names do not.
  • Binary acids always end in "ic acid", oxyacids end in "ic acid" or "ous acid".
  • Hydrophosphoric acid (H₃P(aq)) contains only hydrogen and phosphorus dissolved in water.

Important Notes

  • Not all compounds containing hydrogen are acids. Water (Hâ‚‚O) is not an acid.
  • A compound must contain hydrogen as a cation and be dissolved in water to be classified as an acid.
  • "(aq)" in a chemical formula indicates the compound is aqueous (dissolved in water).
  • Memory aids:
    • "Hydro no O" - If the acid name has "hydro", it means no oxygen is present.
    • "I ate something icky for lunch" - If the polyatomic ion ends in "-ate", change it to "-ic acid" when determining the acid name.
  • You can determine the formula of an acid by knowing the name of its polyatomic ion.
  • Use the naming convention to determine the formula or name of an acid.
  • If an acid does not contain oxygen, it is a binary acid. If it does contain oxygen, it is most likely an oxyacid. If there is a hydro prefix, the acid is an oxyacid.

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