Chemistry Solubility Lab

Which factors can affect the amount of cocoa mix that can be dissolved in water? Check all that apply. adding ice adding heat altering amount of water using a different kind of cocoa mix stirring breaking down the cocoa mix into smaller particles

adding ice adding heat altering amount of water using a different kind of cocoa mix

Which solubility curve on the right best represents the data table on the left?

blue curve

The results of this lab experiment ______________________ the hypothesis.

clearly supported

and the amount of sugar in the solution is the

dependent variable

Temperature is the

independent variable

Spoons added so far:

10

To the nearest gram, what is the mass of one spoonful of sugar?

10 g

Temperature of the water to the nearest degree:

102 degrees C

Spoons of sugar:

14

Temperature of the water to the nearest degree:

2 degrees C

Temperature of the water to the nearest degree:

24 degrees C

Spoons of sugar so far:

25

Thermometer 2

37.0 degrees C

Thermometer 1

42.5 degrees C

Temperature of the water to the nearest degree:

55 degrees C

Spoons of sugar added so far:

8

If beaker tongs are not available, which of these will work instead?

Heat resistant gloves

Answer the lab question ("What is the effect of temperature on the solubility of a solid in a liquid?") with a hypothesis:

If the temperature of the liquid is increased, then more sugar will dissolve, because warm solutions hold more solute than cold solutions.

Think about the lab procedure you just read. Label each factor below V for variable or C for constant. the amount of sugar in the solution whether the sugar is stirred the temperature of the solution the type of solute added the type of solvent used

V: the amount of sugar in the solution C: whether the sugar is stirred V: the temperature of the solution C: the type of solute added C: the type of solvent used

By the end of this lab, you will determine whether you should add cocoa mix (a solid) before or after heating water (liquid) to make hot chocolate. State a broad question about solubility whose answer would help you determine this.

What is the effect of temperature on the solubility of a solid in a liquid?

The picture shows a great deal of cocoa mix on the surface. Suppose that no more cocoa can be dissolved. The solution has reached

saturation

Cocoa mix is the

solute

Water is the

solvent

Therefore, the independent variable was ___________ and the dependent variable was __________.

temperature; solubility

To test the hypothesis above, you changed the ___________ of the solvent and measured the __________ of a solid.

temperature; solubility

Which will ensure laboratory safety during the experiment? Check all that apply.

using beaker tongs to handle the hot beaker checking the beaker for chips prior to heating on the hot plate turning off the hot plate after use