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This overview focuses on the general properties of acids and bases, highlighting their behavior with indicators like litmus, their reactions with metals and each other, and definitions based on different theories. It covers the Arrhenius, Bronsted-Lowry, and Lewis definitions. Key examples include the formation of hydronium ions and neutralization reactions that produce salts and water. It also explores the pH scale and the biological significance of acidic and basic environments within the human body, including blood and digestive fluids.
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General properties ACIDS • Turn litmus • React with active metals – Fe, Zn • React with bases BASES • Turn litmus • Feel soapy or slippery (react with fats to make soap) • React with acids
Definitions Arrehenius only in water Bronsted-Lowry any solvent Lewis used in organic chemistry, wider range of substances Acids – produce H+ Bases - produce OH- Acids – donate H+ Bases – accept H+ Acids – accept e- pair Bases – donate e- pair
Examples The hydrogen ion in aqueous solution H+ + H2O H3O+ (hydronium ion) Arrhenius HCl NaOH Bronsted-Lowry HCl HCN NH3 :NH3 Lewis BF3
Neutralization HCl + NaOH NaCl + HOH In general: Acid + Base Salt + Water All neutralization reactions are double displacement reactions.
105 Db 107 Bh Behavior of oxides in water– Group A basic amphoteric acidic 8A 1A 3A 4A 5A 6A 7A 2A Group B basic: Na2O + H2O 2NaOH (O-2 + H2O 2OH-) acidic: CO2 + H2O H2CO3
pH The biological view in the human body acidic basic/alkaline 1 2 3 4 5 6 7 8 9 10 11 blood saliva urine gastric juice pancreatic juice vaginal fluid bile cerebrospinal fluid Tortora & Grabowski, Prin. of Anatomy & Physiology, 10th ed., Wiley (2003)