chemisrty 15.5 Water as a solvent of ionic compounds 16.1 Precipitation reactions 16.2 Concentration of solutions Flashcards
memorise
what is an ionic lattice
the ions are held together by strong electrostatic forces between the postive and negative ions
what is the attraction between an ion and polar molecules such as water described as?
non-dipole attraction
What happens to a ionic compound when added to water
the postive ends of the water molecules are attracted tot the negatively charged ions and the negative ends of the water molecules are attracted to the postively charged ions
how strong is the water molecules between ions
the water molecules are strong enough that it can pull cations and anions out of the lattice and into the surrounding soloution
what ions are pulled out of the lattice
sodium and chloride that becomes hydrated
why is the attraction for water so strong
the hydrogen atoms in the water molecule are more postive, so they are more orienated towards negative ions such as chloride
what happens when sodium cholride dissolves in water
-ionic bonds within the sodium chloride lattice are broken
-hyrdrogen bonds between water molecules are broken
-ion dipole attractions form between polar water molecules
insoluble ionic compounds do not dissolve in water because
energy requried to seperate the ions from the lattice is greater then the energy released when the ions is hydrated
what ions of the snape rule are soluble
Sodium
Nitrate
Ammonium
Potassium
Ethanoate
Precipiate reaction
during a reaction ions in a solution combine to form a new compound that is insoluble in water.
