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Acids Lesson 6 Acid Rain & Hydrolysis
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Acid Rain The cause of Acid Rain is the release of acid anhydrides into the environment. Acid Anhydrides are nonmetal oxides. NO 2 N 2 O 4 automobile pollution SO 2 SO 3 coal & smelter pollution SO 3 +H 2 O→H 2 SO 4(aq) Rain Acid Rain has pH < 5
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Normal Rain has pH = 6 due to dissolved CO 2 CO 2 +H 2 O→H 2 CO 3 Acid rain dissolves metal, limestone, concrete structures. Acid rain decreases the pH of lakes and causes toxic metals to leach into them.
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is.
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is. →NaCl +HOH
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is. H + OH→NaCl +HOH
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is. HCl+NaOH→NaCl +HOH
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is. HCl+NaOH→NaCl +HOH strong acidstrong baseneutral salt
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 1.Neutral Salts ConsiderNaCl The neutralization equation used to produce NaCl will tell us what kind of salt it is. HCl+NaOH→NaCl +HOH strong acidstrong baseneutral salt When the acid and base parents are both strong the salt is always neutral. -
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A neutral salt will dissociate in water. NaCl → Na + +Cl - Cross off the both ions that come from strong parents as they do not hydrolyze or react further with water- they are neutral. no ions to hydrolyze- neutral
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 2.Basic Salts ConsiderNaCN
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 2.Basic Salts ConsiderNaCN H + OH→NaCN +HOH
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 2.Basic Salts ConsiderNaCN HCN+NaOH→NaCN +HOH
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 2.Basic Salts ConsiderNaCN HCN+NaOH→NaCN +HOH weak acidstrong basebasic salt
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 2.Basic Salts ConsiderNaCN HCN+NaOH→NaCN +HOH weak acidstrong basebasic salt
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A basic salt will first dissociate in water NaCN → Na + +CN - Cross off the Na + because it has a strong parent and does not hydrolyze- it is neutral Then the CN - ion, from the weak parent, will hydrolyze (react with water) as a Bronsted base. CN - +H 2 O ⇄ HCN+OH - negative ion left- basic
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 3.Acidic Salts ConsiderNH 4 Cl →NH 4 Cl
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 3.Acidic Salts ConsiderNH 4 Cl HCl+NH 3 →NH 4 Cl
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 3.Acidic Salts ConsiderNH 4 Cl HCl+NH 3 →NH 4 Cl strong acidweak baseacid salt
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 3.Acidic Salts ConsiderNH 4 Cl HCl+NH 3 →NH 4 Cl strong acidweak baseacid salt
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An acidic salt will first dissociate in water NH 4 Cl → NH 4 + +Cl - Cross off the Cl - because it has a strong parent and does not hydrolyze- it is neutral Then the NH 4 + ion, from the weak parent, will hydrolyze (react with water) as a Bronsted acid. NH 4 + +H 2 O ⇄ H 3 O + +NH 3 positive ion left- acidic
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Hydrolysis of Salts Salts can be acidic, basic, or neutral. 4.Acidic Salts ConsiderFeCl 3 3HCl+Fe(OH) 3 →FeCl 3 +3HOH strong acidweak baseacid salt
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FeCl 3 → Fe 3+ +3Cl - The Fe 3+ ion is an acid Fe(H 2 O) 6 3+ ⇄ H + +Fe(H 2 O) 5 (OH) 2+ You can copy these complex reactions right off the acid chart! positive ion left- acidic
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