Activity 7: Calculations of Mass Concentration

1. What is meant by the statement that the solubility of sugar in water is 204 g/100g?

2. Why should the temperature be stated when giving the solubility of a substance?

3. The solubility of sugar in 100g water at 20C is 204, and solubility for potassium chlorate is 7. Why can almost 30 times more sugar be dissolved?

4. Calculate the following (express all mass concentration answers in g/mL):

• What is the mass concentration of a solution consisting of 100g of sugar and 50mL of water?



• What is the mass concentration of a solution consisting of 360g of salt and 1L of water?



• If I wanted to make a 500mL solution that had a mass concentration of 220g/mL; How much solute would need to be added?



• How much solute needs to be added to 1L of solution in order to create a solution with a mass concentration of 71g/mL?



• A pesticide sprayer (a big bad man out to kill all of the bugs), has run out of pesticide; however, he does have the solute available and he knows what the concentration should be. If he needs a mass concentration of 15g/1L, and he has 4kg of dry chemical; How much water would he need to add to the dry chemical?