Why Is Calcium Chloride, , More Effective at Melting

question 7

Multiple Choice

Why is calcium chloride, , more effective at melting ice than sodium chloride, NaCl?

• A) Calcium ions are both larger and more highly charged and thus more effective in breaking the ice crystal structure.
• B) Calcium ions are smaller than sodium ions and thus more able to get in the way of the water molecules attempting to form the solid state lattice.
• C) Calcium chloride produces three ion particles while sodium chloride produces only two. Greater numbers of ions are more effective at decreasing the number of water molecules entering the solid phase.
• D) Sodium ion is a natural water softener and therefore not as effective in inhibiting the formation of the solid state of water from the liquid.

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