If 75grams of KNO3 are dissolved in 100 grams of H2O at 45 degrees Celsius, what level of saturation is in the soultion.
Do you have a graph in your text or in your notes giving the solubility at various temperatures? If so, look on the graph, determine the solubility at 45 degrees C, then 75/value from graph fractional saturation.
To determine the level of saturation in the solution, we need to compare the amount of solute (KNO3) dissolved to the maximum amount of solute that can be dissolved in the solvent (H2O) at a given temperature. This maximum amount is known as the solubility of the solute.
In this case, we need to find the solubility of KNO3 in water at 45 degrees Celsius. The solubility of KNO3 increases with an increase in temperature, so we need to look it up in a solubility table or reference source. Let's assume that the solubility of KNO3 in water at 45 degrees Celsius is 120 grams per 100 grams of water.
For every 100 grams of water at 45 degrees Celsius, 120 grams of KNO3 can be dissolved. Since you have 100 grams of water, you can calculate the maximum amount of KNO3 that can be dissolved by multiplying the solubility by the mass of water:
Maximum amount of KNO3 = (solubility of KNO3) x (mass of water)
= 120 g/100 g x 100 g
= 120 g
Now that we have calculated the maximum amount of KNO3 that can be dissolved, we can compare it to the actual amount of KNO3 dissolved in the solution, which is 75 grams.
To determine the level of saturation, we calculate the percent of the maximum amount of solute dissolved:
Level of saturation = (Actual amount of solute dissolved / Maximum amount of solute that can be dissolved) x 100
= (75 g / 120 g) x 100
= 62.5%
Therefore, the level of saturation in the solution is 62.5%.