Question

what is missing from the solubility graph shown on the right?

Explanation:

A proper solubility graph requires a label for the y-axis to indicate what solubility measurement (e.g., grams of solute per 100 grams of water) is being plotted, and a legend/label to identify which substances the red and blue lines represent. The given graph only has the x-axis labeled as temperature, with no y-axis units/description or substance identifiers for the curves.

Answer:

The graph is missing:

1. A label for the y-axis (indicating the solubility unit, e.g., g solute/100 g H₂O)
2. Identifiers/legend for the two lines (to show which substances' solubility is plotted)