The solubility curves of the three solid substances X, Y and Z are shown in the figure. In the following statement, the incorrect one is ( )
| A. Solubility: X>Y>Z |
| B. At 50 °C, the mass fraction of solute in X and Y solutions is the same |
| C. When Y contains a small amount of Z, it can be dissolved in water to make a thicker solution, and then cooled and crystallized to purify Y |
| D. X, Y, and Z are all water-soluble substances |
Parsing:
AB
A, the relative solubility should be determined by temperature, so A is wrong;
B, I don’t know the quality of the solute and solvent in the solution, and the solute cannot be determined. The mass fraction, at which the mass fraction of the solute in the saturated solution is equal, so it is wrong;
The solubility of C and Y is greatly affected by temperature, and the solubility of Z is less affected by temperature, so When Y contains a small amount of Z, it can be dissolved in water to make a thicker solution, and then cooled and crystallized to purify Y, correct;
D, observe the solubility curve: at room temperature (20 ° C), The solubility of all three is greater than 10 grams, which is a soluble substance, correct;
AB.