Water Activity in Food Preservation. -solutions -ions -properties of water. Salts are IONIC COMPOUNDS. -Ions form between metals and nonmetals. -All atoms will react until the atoms have 8 electrons in their valence (outer) shells.
-properties of water
-Ions form between metals and nonmetals.
-All atoms will react until the atoms have 8 electrons in their valence (outer) shells.
-Watch the animation of sodium reacting with chlorine to form table salt, sodium chloride (NaCl):
-Other examples of ionic bonding:
Water Activity (Aw) and Free Water in
Water activity osmosis (follow links to sample problems)
Salt and free water
-At the beginning of the meat experiment, where was the water activity the highest: inside of the meat or outside in the bag?
-Would water move from inside meat to outside bag, or from bag into meat? WHY?????