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This is how I should do it
you take to much of salt and do it in a glass,
add enough Distilled water and stir
if all your salt is dissolved you should add more until your salt no longer dissolve.
(it's handy to know the temperature of you solution)
if your solution has reached his saturation level you pour a bit of the water (without the undissolved crystals in a measuringcup. (but first weigh you empty cup)
(let's say you have 100mL of solution)
then you heat up the water until its all gone.
you weigh your cup and the difference between your empty cup, and you're cup with the left overs of your salt is the weight of salt which was dissolved.
imagine you had 100mL of water at 20°C and after boiling away all water you still have 10 grams, it wil mean that there was 10 grams of salt in your 100ml
but then you know that if you have 100mL of water at 20°C you can dissolve 10 grams of salt in it.
actually it is 35.9 g/100 mL (with 25 °C)
I hope I helped you out.
A solubility curve usually shows the solubility of a solute as a function of temperature. So, you find the temperature of interest, and then read the corresponding value off of the line. This usually will be given as grams of solute soluble in 100 ml of solvent, or some similar units.
This curve represent the relation between solubility and temperature.
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