Final answer:
Distillation is the piece of equipment that should be used to separate a mixture of NaCl and H2O.
Step-by-step explanation:
The piece of equipment that should be used to separate a mixture of NaCl and H2O is distillation. Distillation is a physical process that relies on the differences in boiling points of the components in a mixture. A simple distillation apparatus can be used to heat the mixture and collect the more volatile component, in this case, water, while leaving the salt behind.