9.4 Naming and Writing. Formulas for Acids and Bases. Chapter 9 Chemical Names and Formulas. 9.4 Naming and Writing Formulas for Acids and Bases
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1 Chapter 9 Chemical Names and Formulas 9.1 Naming Ions 9.2 Naming and Writing Formulas for Ionic Compounds 9.3 Naming and Writing Formulas for Molecular Compounds 9.4 Naming and Writing Formulas for Acids and Bases 9.5 The Laws Governing How Compounds Form 1
2 Names and Formulas of Acids Names and Formulas of Acids How do you determine the name and formula of an acid? Acids are a group of ionic compounds with unique properties. Acids can be defined in several ways. For now, it is enough to know that an acid is a compound that contains one or more hydrogen atoms and produces hydrogen ions when dissolved in water. 2
3 Names and Formulas of Acids When naming an acid, you can consider the acid to consist of an anion combined with as many hydrogen ions as needed to make the molecule electrically neutral. Therefore, the chemical formulas of acids are in the general form H X, where X is a monatomic or polyatomic anion and n n is a subscript indicating the number of hydrogen ions that are combined with the anion. 3
4 Names and Formulas of Acids Three rules can help you name an acid with the general formula H n X dissolved in water. The naming system depends on the name of the anion (X), in particular the suffix of the anion name. Each rule deals with an anion with a different suffix: -ide, - ite, and -ate. 4
5 Names and Formulas of Acids Three rules can help you name an acid with the general formula H X dissolved in water. n 1. When the name of the anion ends in -ide, the acid name begins with the prefix hydro-. The stem of the anion has the suffix -ic and is followed by the word acid. Therefore, HCl (X= chloride) is named hydrochloric acid. 2. When the anion name ends in -ite, the acid name is the stem of the anion with the suffix -ous, followed by the word acid. Thus, H 2 SO 3 (X = sulfite) is named sulfurous acid. 5
6 Names and Formulas of Acids 3. When the anion name ends in -ate, the acid name is the stem of the anion with the suffix -ic, followed by the word acid. Thus, HNO 3 (X = nitrate) is named nitric acid. Naming Common Acids Anion ending Example Acid name Example -ide chloride, Cl hydro-(stem)-ic acid hydrochloric acid -ite sulfite, SO 3 (stem)-ous acid sulfurous acid -ate nitrate, NO 3 (stem)-ic acid nitric acid 6
7 CHEMISTRY & YOU An acid that provides the crisp taste in many soft drinks has the formula H 3 PO 4. What s the name of this acid? The name of this acid is phosphoric acid. 7
8 Names and Formulas of Acids To write the formula for an acid, use the rule for writing the name of the acid in reverse. Then, balance the ionic charges just as you would for any ionic compound. For example, consider hydrobromic acid. Rule 1 states: When the name of the anion ends in -ide, the acid name begins with the prefix hydro-. The stem of the anion has the suffix -ic and is followed by the word acid. Following Rule 1, hydrobromic acid (hydro- prefix and -ic suffix) must be a combination of hydrogen ion (H + ) and bromide ion (Br ). The formula is HBr. 8
9 Names and Formulas of Acids Writing Formulas of Acids How do you write the formula for phosphorous acid? Rule 2 states: When the anion name ends in -ite, the acid name is the stem of the anion with the suffix -ous, followed by the word acid. Using Rule 1, hydrogen ion and phosphite ion (PO 3 3 ) must be the components of phosphorous acid. You need three hydrogen ions to balance the 3 charge of the phosphite ion. Thus, the formula for phosphorous acid is H 3 PO 3. 9
10 Names and Formulas of Acids Finally, what is the formula for sulfuric acid? Rule 3 states: When the anion name ends in -ate, the acid name is the stem of the anion with the suffix -ic, followed by the word acid. According to Rule 3, sulfuric acid (-ic ending) must be a combination of hydrogen ion and sulfate ion (SO 4 2 ). The formula for sulfuric acid is H 2 SO 4 because two hydrogen ions are needed to balance the 2 charge of the sulfate anion. 10
11 Names and Formulas of Acids Writing Formulas of Acids Many industrial processes, including steel and fertilizer manufacturing, use acids. You should become familiar with the names and formulas of common acids such as those listed in the table at right. Common Acids Name Formula Hydrochloric acid HCl Sulfuric acid H 2 SO 4 Nitric acid HNO 3 Ethanoic/Acetic acid HC 2 H 3 O 2 Phosphoric acid H 3 PO 4 Carbonic acid H 2 CO 3 11
12 Sample Problem 9.8 Naming Acids Name the following compounds as acids. a. HClO b. HCN 12
13 Sample Problem Analyze Identify the relevant concepts. The anion of the acid determines the acid name. (1) If the name of the anion ends in -ide, name the acid using the stem of the anion with the prefix hydro- and the suffix -ic, followed by the word acid. (2) If the anion name ends in -ite, name the acid using the stem of the anion with the suffix -ous, followed by the word acid. (3) If the anion name ends in -ate, name the acid using the stem of the anion with the suffix -ic, followed by the word acid. 13
14 Sample Problem Solve Apply concepts to this problem. Identify the anion in the acid and the suffix of the anion name. a. HClO: ClO, (hypochlorite) b. HCN: CN, (cyanide) 14
15 Sample Problem 9.8 Solve 2 Apply concepts to this problem. Name the acid using the appropriate prefix (if any) and suffix. Finish with the word acid. a. HClO: ClO, (hypochlorite) hypochlorous acid (Rule 2) b. HCN: CN, (cyanide) hydrocyanic acid (Rule 1) 15
16 What is the name of the acid H 2 S? (Hint: X = sulfide) H 2 S is named hydrosulfuric acid. Use Rule 1: When the name of the anion ends in -ide, the acid name begins with the prefix hydro-. The stem of the anion has the suffix -ic and is followed by the word acid. 16
17 Names and Formulas of Bases How do you determine the name and formula of a base? A base is generally an ionic compound that produces hydroxide ions when dissolved in water. Bases are named in the same way as other ionic compounds the name of the cation is followed by the name of the anion. 17
18 Names and Formulas of Bases The common base sodium hydroxide is used in making cleaners, soap, and paper, as shown in the figure at right. Sodium hydroxide (NaOH) is composed of sodium cations (Na + ) and hydroxide anions (OH ). 18
19 Names and Formulas of Bases For example, aluminum hydroxide consists of the aluminum cation (Al 3+ ) and the hydroxide anion (OH ). You need three hydroxide ions to balance the 3+ charge of the aluminum cation. Thus, the formula for aluminum hydroxide is Al(OH) 3. 19
20 Sample Problem 9.9 Naming Bases Name the following bases. a. KOH b. Fe(OH) 2 20
21 Sample Problem Solve Apply the concepts to this problem. First, identify the cation and the anion in the compound. a.koh: cation: K + anion: OH b. Fe(OH) 2 : cation: Fe 2+ anion: OH 21
22 Sample Problem Solve Apply the concepts to this problem. Now write the name of the cation, followed by the name of the anion. a.koh: cation: K + anion: OH potassium hydroxide b. Fe(OH) 2 : cation: Fe 2+ anion: OH iron(ii) hydroxide 22
23 Key Concepts If the anion name ends in -ide, the acid name begins with the prefix hydro-. The stem of the anion has the suffix -ic and is followed by the word acid. If the anion name ends in -ite, the acid name is the stem of the anion with the suffix -ous, followed by the word acid. If the anion name ends in - ate, the acid name is the stem of the anion with the suffix -ic, followed by the word acid. To write the formula for an acid, use the rule for writing the name of the acid in reverse. 23
24 Key Concepts Bases are named like other ionic compounds. To write the formula for a base, write the symbol for the metal cation followed by that of the hydroxide ion. Then, balance the ionic charges. acid: a compound that produces hydrogen ions in solution; see also hydrogen-ion donor, Lewis acid base: a compound that produces hydroxide ions in solution; see also hydrogen-ion acceptor, Lewis base 24
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