notes – properties of water /chemical reactions. v v
TRANSCRIPT
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Notes – Properties of Water /Chemical
Reactions
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v
v
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Properties of Water
• Hydrogen Bonds – Weak forces between some covalently bonded molecules (polar molecules)
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Properties of Water
• Properties of Water
• Cohesion – polar molecules attract and stick together
• Adhesion – water molecules stick to other molecules
• Examples
Surface tension, capillary action, high boiling point, water in sphere droplets, high heat capacity (storage)
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Fig. 3-3
Water-conductingcells
Adhesion
Cohesion
150 µm
Directionof watermovement
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Fig. 3-4
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Properties of Water
• Properties of Water• Universal solvent –
More substances dissolve in water than any other molecule.
• Solvent – The substance other substances dissolve in.
• Solute – The substance being dissolved
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Properties of Water
Solutions - Mixtures in which one or more substances are uniformly distributed in another.
• A Solute is dissolved in a solvent.
• Examples:
Aqueous solutions (water solvent), blood plasma, plant sap, seawater.
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Salt in Water
• Salt in water dissolves and becomes positive and negative ions.
• Saltwater conducts electricity
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• Salt in water dissolves and becomes positive and negative ions.
• Saltwater conducts electricity
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Salt in Water
• Salt in water dissolves and lowers the freezing point of water.– Ex: Applying salt on icy
roads causes ice to melt
• Salt in water dissolves and raises the boiling point of water
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Salt in Water
• Salt in water dissolves and lowers the freezing point of water.– Ex: Applying salt on icy
roads causes ice to melt
• Salt in water dissolves and raises the boiling point of water– Ex: Adding salt to water
makes water boil hotter and cooks food faster
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Solubility – The maximum quantity of a substance that will dissolve in a certain
quantity of water at a specified temperature
• Solubility curve – Graphical representation of the amount of solute that dissolves in a given amount of solvent
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Solubility – The maximum quantity of a substance that will dissolve in a certain
quantity of water at a specified temperature
• Solubility curve – Graphical representation of the amount of solute that dissolves in a given amount of solvent
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Concentration – How much solute is dissolved in a specific quantity of solvent or
solutionSolubility can be
measured in :• per cent % - parts per
hundred• ppm – parts per
million• ppb – parts per billion
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Solubility - concentrations depend on the amount/type of solvent and
the temperature• Saturated – solutions
holding the maximum amount of solute
• Unsaturated – solutions holding less than the max. amount
• Supersaturated – solutions holding more than the max amount of solute
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Solubility - concentrations depend on the amount/type of solvent and
the temperature• Saturated – solutions
holding the maximum amount of solute
• Unsaturated – solutions holding less than the max. amount
• Supersaturated – solutions holding more than the max amount of solute
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Solubility - concentrations depend on the amount/type of solvent and the
temperature• Saturated – solutions
holding the maximum amount of solute
• Unsaturated – solutions holding less than the max. amount
• Supersaturated – solutions holding more than the max amount of solute
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Solubility
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Solubility
• Substances that dissolve in H2O are soluble.
• If substances do not dissolve in water they are insoluble.
• Substances that dissolve in water are ionic compounds or other polar molecules
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Solubility
• Substances that dissolve in H2O are soluble.
• If substances do not dissolve in water they are insoluble.
• Substances that dissolve in water are ionic compounds or other polar molecules
• Ex: Salts, Alcohol
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Solubility
• Nonpolar substances do not have partial charges.
• They do not readily dissolve in water
• Nonpolar substances include oils, petroleum products, kerosene
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Solubility
• Nonpolar substances will dissolve in other nonpolar substances.
• Ex: Paint thinner for oil-based paints
• Like dissolves in like
• Soap breaks nonpolar molecules into smaller particles to make them more soluble in water
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Solubility
• Nonpolar substances will dissolve in other nonpolar substances.
• Ex: Paint thinner for oil-based paints
• Like dissolves in like
• Soap breaks nonpolar molecules into smaller particles to make them more soluble in water
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Measuring Solubility
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Water Dissociation – Self Ionization
• Water can break down into ionized particles
H20 (l) = H+ (aq) + OH- (aq)
H20 + H+ = H30 +
Hydronium ion
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ACID / BASE
• Acid/Base – Special compounds containing excess :
• Hydrogen (H+) (H30+ ) (hydronium) (acids)
or • Hydroxide (OH-) ions
(charged particles) dissolved in water (base)
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ACID / BASE
• Acid/Base – Special compounds containing excess :
• Hydrogen (H+) (H30+ ) (hydronium) (acids)or
• Hydroxide (OH-) ions (charged particles) dissolved in water (base)
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ACID / BASE
• Acid/Base – Special compounds containing excess :
• Hydrogen (H+) (H30+ ) (hydronium) (acids)or
• Hydroxide (OH-) ions (charged particles) dissolved in water (base)
• pH = Scale to measure H+ concentration (-log)
• pH 1= 1/10=1/101 H+• pH 2 = 1/100=1/102
• pH 3 = 1/1000= 1/103
• pH 1 = highest H+
• pH 14= lowest H+
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ACID / BASE
• Acid/Base – Special compounds containing excess :
• Hydrogen (H+) (H30+ ) (hydronium) (acids)or
• Hydroxide (OH-) ions (charged particles) dissolved in water (base)
• pH = Scale to measure H+ concentration (-log)
• pH 1= 1/10=1/101 H+
• pH 2 = 1/100=1/102
• pH 3 = 1/1000= 1/103
• pH 1 = highest H+
• pH 14= lowest H+
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ACID / BASE
• Acid/Base – Special compounds containing excess :
• Hydrogen (H+) (hydronium) (acids)or
• Hydroxide (OH-) ions (charged particles) dissolved in water (base)
• pH = Scale to measure H+ concentration (-log)
• pH 1= 1/10=1/101 H+
• pH 2 = 1/100=1/102
• pH 3 = 1/1000= 1/103
• pH 1 = highest H+
• pH 14= lowest H+
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Acids
• Made up of molecules including one or more hydrogen (H+) (H30+ ) atoms that can be easily released in water solutions
• Substances in common have a sour taste
• Ex: Lemons, vinegar
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Acids
• Made up of molecules including one or more hydrogen (H+) (H30+ ) atoms that can be easily released in water solutions
• Substances in common have a sour taste
• Ex: Lemons, vinegar
• Acids contain (H+) ions and compounds are renamed as acids
• Example:• HCl = Hydrogen
Chloride
renamed:
Hydrochloric Acid
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Acids
Formula name
HCl =
H2CO3 =
HC2H3O2 =
HNO3 =
H3PO4 =
H2SO4 =
Acid Name
HCl =
H2CO3 =
HC2H3O2 =
HNO3 =
H3PO4 =
H2SO4 =
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Acids
Formula name
HCl = Hydrogen Chloride
H2CO3 = Hydrogen Carbonate
HC2H3O2 = Hydrogen Acetate
HNO3 = Hydrogen Nitrate
H3PO4 = Hydrogen Phosphate
H2SO4 = Hydrogen Sulfate
Acid Name
HCl = Hydrochloric Acid
H2CO3 = Carbonic Acid
HC2H3O2 = Acetic Acid
HNO3 = Nitric Acid
H3PO4 = Phosphoric Acid
H2SO4 = Sulfuric acid
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Acid / Base• Acid (H+) (H30+ ) =
Hydronium ion• pH 1-6• 1 is strongest , 6 is
weakest
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Bases
• Ionic substances that include (OH-) hydroxide ions or generate (OH-) ions in solution
• In common substances have a bitter taste and slippery feel
• Ex: soap, peppers
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Bases
• Ionic substances that include (OH-) hydroxide ions or generate (OH-) ions in solution
• In common substances have a bitter taste and slippery feel
• Ex: soap, peppers
• Bases keep their original compound name
• Ca(OH)2 =
• Mg(OH)2 =
• KOH =
• NaOH =
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Bases
• Ionic substances that include (OH-) hydroxide ions or generate (OH-) ions in solution
• In common substances have a bitter taste and slippery feel
• Ex: soap, peppers
• Bases keep their original compound name
• Ca(OH)2 = Calcium Hydroxide
• Mg(OH)2 = Magnesium
Hydroxide• KOH = Potassium Hydroxide
• NaOH = Sodium Hydroxide
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• Base (OH-) = Hydroxide ion
• pH 8-14• 14 is strongest, 8 is
weakest
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Acid / Base• Acid (H+) =
Hydronium ion• pH 1-6• 1 is strongest , 6 is
weakest
• Base (OH-) = Hydroxide ion
• pH 8-14• 14 is strongest, 8 is
weakest
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Neutral pH
• pH 7
• H+ = (OH)- = neutral
H+ + (OH)- =HOH=H2O
Ex: Distilled water
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pH indicators
Indicators – show pH with color changes. H+ or (OH)- concentrationsEx: Litmus paper, phenolphthalein
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Acid / Base
• Neutralization Equation• Reactants Products
• HCl + NaOH = NaCl + H2O
• Acid Base Salt Water• pH1 pH14 pH7 pH7
• Buffer – Baking Soda (HCO3-) prevents pH change
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Acid / Base
• Neutralization Equation• Reactants Products• 1M HCl + 1M NaOH =
1M NaCl + 1M H2O
• Acid + Base = Salt + Water• pH1 pH14 pH7 pH7
• Buffer – Baking Soda (HCO3-) prevents pH change
• Titration – adding known quantities of acids and/or bases together to determine M or pH quantities
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