Lab Videos

Measurements

• Buret tip air bubble

• Rubber stopper--using toploading balance

• Rubber stopper--using toploading slide door balance

• wooden block on ruler

Acid/Base titrations

• Titration concepts summary

• Scooping solids

• Scooping/weighing solids--toploading balance

• Scooping/weighing solids--toploading slide door balance

• Buret tip air bubble

• Solids dissolving and reacting  
  H2C2O4 . 2H2O(s) can react as it dissolves.  You can start a titration run before all the (s) dissolves, but you cannot FINISH a titration run if all the solid is not dissolved.

Gas Laws, H2O2 decomposition 

• Reading the grad cylinder volume at the right water level, so that P(inside) = P(atmosphere)

• Filling the graduate cylinder completely with water (NO bubbles initially)

• Assembling the gas decomposition apparatus 

Separations

• Scooping solids

• Scooping/weighing solids--toploading balance

• Scooping/weighing solids--toploading slide door balance

• Setting filter height

• Folding filter paper

• Filtering sand, stream of water

• Drying sand

• Weighing dry sand

Chemical reactions

• Lighting/operating a Bunsen burner

• Heating a sample in a test tube 

Density Lab

• Careless liquids poured, no layers

• Pouring liquids together to avoid mixing

• Adding solids without sloshing for volume displacement

• Cleaning the graduated cylinder between liquids

• Temperature dependent density demo