A sodium chloride crystal in a beaker. As water is added the salt dissolves into positive sodium ions and negative chloride ions. Hydration refers to the final state of this process such that the water molecules tend to orient around the ions. With the oxygen atom of the water pointing towards the positive sodium ions and hydrogen ions point towards the negative chloride ions. When the NaCL dissolves, the temperature of the solution decreases slightly. Based on this, the heat of solution of NaCL would be.
A. Zero
B. Small positive value
C. Large positive value
D. Small negative value
E. Large negative value