Question

Suppose you find that you are able to dissolve 700.0 grams of salt in 2.0 L of water at 25o C. What is the measured solubility of salt in water? Answer in units of grams solute per kilogram solvent. The total solubility of salt at this temperature is _________ grams of salt per kilogram of water.

Suppose you find that you are able to dissolve 700 grams of salt in 2.0 L of water at 25o C. The expected amount is 360 grams per kilogram.What is your percent error for this experiment? Note: you do not need to include any minus (-) or percentage (%) signs in your answer.  The absolute value of the percent error is _______ %.

Answer 1

Amount of salt dissolved = 700.0 g

Volume of water = 2.0 L = 2000 mL

We know that water has a density of 1.0 g/mL at 25 C.

Hence, mass of water =

Hence, the solubility of salt in water can be calculated as follows:

Hence, we can fill the blanks as follows:

The total solubility of salt at this temperature is 350 grams of salt per kilogram of water.

Now, it is given that the expected known value of solubility = 360 g per kilogram.

Hence, the percent error can be calculated as follows:

Hence, we can fill the blanks as follows:

The absolute value of the percent error is 2.78 %.

Note: Answers are rounded to three significant figures.