Science Lab - Relationship Between Temperature and Solubility Using a Laboratory Procedure

Solubility Lab

The purpose of this lab was to explore the relationship between temperature and solubility using a laboratory procedure.  It took 45 minutes. The question was what is the effect of temperature on the solubility of a solid in a liquid? My hypothesis was If the temperature of the liquid is increased, then more sugar will dissolve because warm

solutions hold more solute than cold solutions.  
The dependent variable is the amount of sugar that can be dissolved. The independent varibale is the temperature of the water.

You should always wear a lab gown and safety goggles while performing an experiment. Behavior in the lab needs to be purposeful. Use caution while working around the hot plate. Check glassware, such as your beaker, for cracks and chips prior to use. Remember to always use the tongs while handling the hot beaker. Report all accidents—no matter how big or small—to your teacher.

The material needed for this experiment is:

 ▪ 100 mL beaker

▪ beaker tongs

▪ spoon

▪ stirring rod

▪ thermometer

▪ hot plate

▪ hot pad

▪ balance

▪ 300 g sugar

▪ ice

▪ water

▪ weigh paper

  Then you Use a weighing paper to measure the number of grams of sugar that are in one spoonful ofsugar. Be sure to use a level spoonful, not a heaping spoonful, to help ensure that each timeyou add sugar, it is approximately the same amount. Record that value above the data table.

Place ice in a 100 mL beaker. Fill the beaker with water until the ice and water total 50 mL.

Stir until just a small amount of ice remains. Let the temperature of the chilled water stabilize

to obtain a temperature ≈ 5°C (between 0°C and 10°C).

b) Record the temperature in celcious

c) Add a spoonful of sugar (again, a level spoonful, not a heaping spoonful). Stir using the

stirring rod. Continue adding spoonfuls of sugar until the solution becomes saturated, stirring

after each spoonful is added.

d) After the solution reaches saturation, record the amount of sugar (in spoonfuls) dissolved

before the saturation point. Do not discard the solution; continue to use it throughout

the rest of the procedure.

Step 4: Measure Solubility in Room Temperature Water

a) Place the beaker on the hot plate (setting on medium). Check the water temperature

periodically until the water reaches ≈ 25°C (between 20°C and 30°C). Use the tongs to

remove the beaker from the hot plate.

b) Record the temperature in °C.

c) Add a spoonful of sugar, and stir using the stirring rod. Continue adding spoonfuls of sugar

until the solution becomes saturated, stirring after each spoonful is added.

d) After the solution reaches saturation, record the amount of sugar (in spoonfuls) dissolved