acids and bases - la salle college high school - home_bases,_organic_chem.pdf · acids and bases in...
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Acids and Bases
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Acids and BasesIn any solution, a scientist can talk
about the concentration of the atoms that are dissolved in the solvent.
i.e. Salt water is an example of Na+ and Cl- in a solution of water
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Acids and Bases
pH is a measure of the acidity or alkalinity of a solution
The negative logarithm of the concentration of H+ ions.
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Properties
• ACIDSSour to taste
NEVER TOUCH
Blue litmus to red
pH<7
React with bases to give a salt and water
• BASESBitter to taste
Slippery to touch
Red litmus to blue
pH>7
React with acids to give a salt and water
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Indicators
• Phenolphthalein
• Bromothymol blue
• Litmus
• Universal Indicator
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Phenolphthalein
• Colorless in acid and light pink in the presence of base.
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Bromothymol blue
• Acids appear yellow
pH<7
• Bases appear blue
pH>7
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Red and Blue Litmus
• Basic solutions turn red litmus to blue.
• Acidic solutions turn blue litmus to red.
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Universal Indicator
• Varies in color in response to acids and bases of different concentrations.
Paper that contains dried Universal Indicator.
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Neutralization Reactions
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12
Acids
Dissociate in water and release
hydrogen ions (H+)
Hydrochloric acid (stomach acid) is a
gas with symbol HCl
In water, it dissociates into H+ and Cl-
Dissociation of HCl is almost total, therefore it is a strong acid
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13Bases:
Either take up hydrogen ions (H+) or release hydroxide ions (OH-)
Sodium hydroxide (drain cleaner) is a solid with symbol NaOH
In water, it dissociates into Na+ and OH-
Dissociation of NaOH is almost total, therefore it is a strong base
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14The pH Scale
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Buffers and pH
When H+ is added to pure water at pH 7, pH goes down and water becomes acidic
When OH- is added to pure water at pH 7, pH goes up and water becomes alkaline
Buffers are solutes in water that resist change in pH
When H+ is added, buffer may absorb, or counter by adding OH-
When OH- is added, buffer may absorb, or counter by adding H+
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Buffers in Biology
Health of organisms requires maintaining pH of body fluids within narrow limits
Human blood normally 7.4 (slightly alkaline)
Many foods and metabolic processes add or subtract H+ or OH- ions
Reducing blood pH to 7.0 results in acidosis
Increasing blood pH to 7.8 results in alkalosis
Both life threatening situations
Bicarbonate ion (-HCO3) in blood buffers pH to 7.4
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Organic Chem. Outline
Organic vs Inorganic
Functional Groups and Isomers
Macromolecules
Carbohydrates
Lipids
Proteins
Nucleic Acids
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18Organic Molecules
Inorganic – Chemistry of elements other than carbonOrganic – Carbon-based chemistry
Usually associatedliving systems
Often associated with nonliving matter
Often quite large, withmany atoms
Always withfew atoms
Alwayscovalent bonding
Usuallyionic bonding
Always containcarbon and hydrogen
Usually with+ & - ions
OrganicInorganic
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Carbon Atom
Carbon atoms:
Contain a total of 6 electrons
Only four electrons in the outer shell
Very diverse as one atom can bond with up to four other atoms
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Carbon Atom
Carbon atoms:
Often bonds with other carbon atoms to make hydrocarbons
Can produce long carbon chains like octane
Can produce ring forms like cyclohexane
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Octane & Cyclohexane
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Functional Groups
Specific combinations of bonded atoms
Attached as a group to other molecules
Always react in the same manner, regardless of
where attached
Determine activity and polarity of large organic
molecules
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Polar; some sugarsExample: Acetone
Polar, forms H-bonds; some sugarsand amino acids Example: EthanolR OH
RH
CO
R RC
O
ROH
CO
RH
NH
R SH
Biologically Important Functional Groups
Thiols
Phosphate
AminesAmino
CarboxylicAcidsCarboxyl
Ketones
AldehydesCarbonyl
AlcoholsHydroxyl
CompoundStructureGroup
Sulfhydryl
R RC
O
OH
OrganicPhosphates
Significance
Polar; some sugarsExample: Formaldehyde
Polar, acidic; fats and amino acidsExample: Acetic acid
Polar, basic; amino acidsExample: Tryptophan
Disulfide Bonds; some amino acidsExample: Ethanethiol
Polar, acidic; some amino acidsExample: Adenosine triphosphate
Polar, forms H-bonds; some sugarsand amino acids; Example: Ethanol
Polar; some sugarsExample: Formaldehyde
Polar; some sugarsExample: Acetone
Polar, acidic; fats and amino acidsExample: Acetic acidPolar, acidic; some amino acidsExample: Adenosine triphosphate
Disulfide Bonds; some amino acidsExample: Ethanethiol
Polar, basic; amino acidsExample: Tryptophan
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Dehydration and Hydrolysis
Dehydration - Removal of water molecule
Used to connect monomers together to make polymers
Polymerization of glucose monomers to make starch
Hydrolysis - Addition of water molecule
Used to disassemble polymers into monomer parts
Digestion of starch into glucose monomers
Specific enzymes required for each reaction
Accelerate reaction
Are not used in the reaction
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26Synthesis and Degradationof Polymers
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Polar; some sugarsExample: Acetone
Polar, forms H-bonds; some sugarsand amino acids Example: EthanolR OH
RH
CO
R RC
O
ROH
CO
RH
NH
R SH
Biologically Important Functional Groups
Thiols
Phosphate
AminesAmino
CarboxylicAcidsCarboxyl
Ketones
AldehydesCarbonyl
AlcoholsHydroxyl
CompoundStructureGroup
Sulfhydryl
R RC
O
OH
OrganicPhosphates
Significance
Polar; some sugarsExample: Formaldehyde
Polar, acidic; fats and amino acidsExample: Acetic acid
Polar, basic; amino acidsExample: Tryptophan
Disulfide Bonds; some amino acidsExample: Ethanethiol
Polar, acidic; some amino acidsExample: Adenosine triphosphate
Polar, forms H-bonds; some sugarsand amino acids; Example: Ethanol
Polar; some sugarsExample: Formaldehyde
Polar; some sugarsExample: Acetone
Polar, acidic; fats and amino acidsExample: Acetic acidPolar, acidic; some amino acidsExample: Adenosine triphosphate
Disulfide Bonds; some amino acidsExample: Ethanethiol
Polar, basic; amino acidsExample: Tryptophan
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30Macromolecules
Some molecules are called macromolecules because of their large size
Usually consist of many repeating units
-Resulting molecule is a polymer (many parts)
-Each repeating unit is called a monomer
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Macromolecules
NucleotideDNA, RNANucleic Acids
Amino acidPolypeptideProteins
MonosaccharidePolysaccharideCarbohydrates
Glycerol & fatty acidsFatLipids
Subunit(s)ExampleCategory
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32Common Foods
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Four Classes of Organics: 1 - Carbohydrates
Monosaccharides
Disaccharides
Polysaccharides
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Monosaccharides
Single sugar molecules
Quite soluble and sweet to taste
Examples
Glucose, fructose (fruit)
Ribose and deoxyribose (in nucleotides)
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35Carbohydrates
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Disaccharides
Contain two monosaccharides joined
Soluble and sweet to taste
Examples
Sucrose
Table sugar, maple sugar
One glucose and one fructose joined
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Synthesis of a Disaccharide
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Polymers of monosaccharidesLow solubility; not sweet to taste
ExampleStarch Used for short-term energy storage
Cellulose Main component of wood and many natural fibers
All polymers of glucose, with different structures
Polysaccharides
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39Starch
Structure and Function
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40Cellulose
Structure and Function
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2 - Lipids
Insoluble in waterLong chains of repeating CH2 unitsRenders molecule symmetrical and nonpolar
Types of Lipids
MedicinesComponent of plasma membrane; hormonesSteroids
No-stick pan sprayComponent of plasma membranePhospholipids
Cooking oilsLong-term energy storage in plants and their seedsOils
Butter, lardLong-term energy storage & thermal insulation in animalsFats
Human UsesOrganismal UsesType
Candles, polishesWear resistance/Coating; helps plants retain waterWaxes
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Types of Lipids:
Triglycerides (Fats)
Long-term energy storage
Three fatty acids attached to each glycerol
molecule
Long hydrocarbon chain
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Synthesis of Triglyceridefrom Glycerol and Three Fatty Acids
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Types of Lipids:Triglycerides
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46Types of Lipids:
Phospholipids
Derived from triglycerides
Two fatty acids attached instead of three
Molecules self arrange when placed in water
Polar phosphate “heads” next to water
Nonpolar fatty acid “tails” overlap and
exclude water
Spontaneously form double layer & a sphere
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Phospholipids Form Membranes
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Monosaccharides
triglycerides
Strarch
Deoxyribose
Disaccharides
Phospholipids
Oils
Steroids
Polysaccharides
Glucose
Fructose
Lipids and Carbohydrates Review
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51More Types of Lipids:
Steroids
testosterone, estrogen and Cholesterol
Skeletons of four fused carbon rings
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Steroid Diversity
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53Types of Lipids:
Waxes
Long-chain fatty acid bonded to a long-chain alcohol
High melting point
Waterproof
Resistant to degradation
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3 -Proteins
Functions
Support – Collagen
Enzymes – Almost all enzymes are proteins
Transport – Hemoglobin; membrane proteins
Defense – Antibodies
Hormones – Many hormones; insulin
Motion – Muscle proteins, microtubules
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Protein Subunits:
The Amino Acids
• Proteins are polymers of amino acids
• There are 20 different amino acids that make up
proteins
• All of them have similar structures
• Amino acids joined together end-to-end
• Special name for this bond - Peptide Bond
• Virtually unlimited number of proteins
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56Protein Molecules:
Levels of StructurePrimary:
String of amino acids
Secondary:
amino acid chain coils or folds; tied like a knot
Tertiary:
3-D shaped chain of amino acids with peptide bond
Complex knot
Quaternary:
Consists of more than one protein
Like several knots glued together
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4 -Nucleic Acids
Polymers of nucleotides
DNA (deoxyribonucleic acid)
Double-stranded helical spiral (twisted ladder)
Serves as genetic information center
In chromosomes
RNA (ribonucleic acid)
Part single-stranded, part double-stranded
Serves primarily in assembly of proteins
In nucleus and cytoplasm of cell
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DNA Structure RNA Structure
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Other Nucleic Acids
ATP (adenosine triphosphate) is composed of adenine, ribose, and three phosphates
In cells, one phosphate bond is hydrolyzed –Yields:
The molecule ADP (adenosine diphosphate)
An inorganic phosphate molecule pi
Energy
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ATP