Two experiments are given below. experiment 1: A large amount of copper(II) sulfate is stirred into a beaker containing water. After a few minutes, crystals that have not dissolved can be seen at the bottom of the beaker. experiment 2: Sea water is distilled. Distilled water and solid impure salt are collected separately in two containers. Which statement is correct?
- AIn experiment 1, the undissolved crystals are the filtrate.
- BIn experiment 1, the water is the solute.
- CIn experiment 2, sea water boils at $100\,^{\circ}\text{C}$.
- DIn experiment 2, the impure salt is a residue.