Solutions and Solubility (5/10)
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Solution definition
A homogeneous mixture • mixture: two substances • Homogeneous: evenly distributed • Heterogeneous: not evenly distributed (like a salad)
Dissoultion
Minority component (solute) reacts with solvent (majority component)
Dissolving
Like dissolves like -polar amino acids dissolve most readily in polar solvents (like water)
Saturation
extent which solute is dissolved in solvent -adding more solute than what solvent can handle to dissolve will precipitate
Supersaturation
Solute concentration>solute solubility must heat and cool slowly to keep all dissolved. If not, crystallized
Electrolyte
Ions conduct electricity in a solution
higher temperature for solids
higher solubility in endothermic reactions
Higher temperature for gases
lowers solubility for gases
Solubility rules: alkali metals
All soluble in water
Solubility rules: Nitrates
All soluble in water
Solubility rules: Halides
soluble in water except when combined with silver, lead, or mercury
Solubility rules: Sulfates
Souble in water except when combined with calcium, silver, lead, etc
Solubility rules: Carbonate, phosphate, sulfide
Insoluble except when combined with sodium carbonate or ammonium phosphate
Solubility rules: Hydroxides and metal oxides
Insoluble except if combined with alkali metals
Molarity
moles of solute/Liters of solution
Molality
Moles of solute/Kg of solvent
High concentration of solute
Impacts volume Molarity does not equal molality
Colligative properties
Properties changing solely with the concentration of solute in solution
Normality
Equivalents of solute/ Liters of solution
Calculating normality
(molarity of acid) x (acidic protons per molecule) molarity of base) x (hydroxide ions per molecule
Solubility equilibria
balance between reactant and balanced species
Ksp expression
Product ions only high value = large concentration of dissolved ions (high solubility)
Insolubility
No compound is truly insoluble
Molar solubility
Ksp/[cation] = [anion] number of moles that need to dissolved for the solution to be saturated