Selecting a Lab question

Yesterday you observed a reaction between hydrochloric acid and magnesium. You also made a hypothesis about how changing the temperature of the hydrochloric acid would impact the speed of the reaction and how changing the concentration of the hydrochloric acid would impact the speed of the reaction. Today you are going to choose  ONE of those to investigate and begin preparing your investigation.

These are the supplies that are available: 

up to 15 test tubes (small)

test tube rack

test tube clamp (for moving test tubes)

hot plate

ice 

up to three 250 mL beakers

thermometer

Hydrochloric acid in the following concentrations:

0.5 M

1.0 M

3.0 M

6.0 M

up to 15 strips of Mg (each 1 cm long)

waste container

goggles

up to 5 pipettes