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Salty Water Question

Question: If you pour a handful of salt into a full glass of water does the water level go down, or does the glass overflow?

If you start with pure water, and add a small amount of salt then the level will go down slightly, there will be no overflow. This is the reason (true!)

There is space between water molecules. When you pour the salt slowly, this fills up the space between the molecules. Salt (NaCl) readily dissolves in water producing Na+ and Cl- ions. Na+ goes to the negative end of H20 molecule and CL- goes to the positive end of H2O molecule. In this way the force of attraction decreases the total volume of the salt solution. This effect only continues until no more salt can dissolve in the water.