Pre-Lab - Mole Relationships in a Chemical Reaction

What solid are you starting with in the lab?

• No idea.  It is an unknown solid

• Sodium bicarbonate (a.k.a sodium hydrogen carbonate or baking soda)

• table salt (NaCl)

What liquid are you adding to the solid?

• HClO₃

• Water

• HCl

• H₂SO₄

How do you know when to stop adding the acid?

• When the reaction stops fizzing

• When you add 20 drops

• When you add the specific amount stated in the lab

When you are rinsing off the watch glass, how much water do you use?

• 5 mL

• The least amount necessary

• 10 mL

• You keep using water until the liquid is just below the lip of the evaporating dish

What do you do with the evaporating dish after you rinse off the watch glass?

• Get the mass first, then dispose of it in the trash.

• Bring the evaporating dish up front.  Put it on a tray on top of a piece of paper with your initials on it.

• Get the mass first, then pour it down the drain.

• Pour the contents down the drain.