How do I calculate the solubility of a compound in grams of solute per 100 grams of solution?
Look at the graph or table of solubility OR use Ksp if it is essentially insoluble.
Calculating the solubility of a compound involves determining the maximum amount of solute (the substance being dissolved) that can be dissolved in a given amount of solvent (usually water). The solubility is often expressed in grams of solute per 100 grams of solution, which is a common way to compare the solubility of different compounds.
To calculate the solubility in grams of solute per 100 grams of solution, you need to know two pieces of information:
1. Mass of the solute dissolved in the solvent.
2. Total mass of the resulting solution.
Here's how you can calculate the solubility:
1. Determine the mass of the solute: This is the amount of the compound that gets dissolved in the solvent. It is usually given in grams. Let's say the mass of the solute is "x" grams.
2. Determine the total mass of the solution: This is the combined mass of the solute and the solvent. It is usually given in grams. Let's say the total mass of the solution is "y" grams.
3. Calculate the solubility: The solubility is equal to the mass of the solute (x) divided by the total mass of the solution (y), multiplied by 100 to express it as grams of solute per 100 grams of solution. The formula is:
Solubility = (x / y) * 100
For example, if you have 20 grams of solute dissolved in 80 grams of solution, the solubility would be:
Solubility = (20 / 80) * 100 = 25 grams of solute per 100 grams of solution.
Remember to always use the same units (grams) for the solute and the solution mass to ensure accurate calculations.