this is only experimental data, but it might give you a clue. i found it on a coursework site when i was doing cw on potassium nitrate, it looks roughly right, just you need to match up columns with their headings.
Mass of potassium nitrate in the saturated solution /g Volume of water in the saturated solution /cm³ Temperature of the saturated solution Reciprocal of Kelvin temperature (1/T)/K-1 Solubility of potassium nitrate/mol dm-3 of water ? Log 10 ?
Celsius T/ºC Kelvin T/K
10.1 8.0 67º 340 1/340 12.5 1.09
10.1 10.0 57º 330 1/330 10 1
10.1 12.0 48º 321 1/321 8.33 0.92
10.1 14.0 42º 315 1/315 7.14 0.85
10.1 16.0 39º 312 1/312 6.25 0.79