Dressen-Double Replacement Lab

Slide 1:

Lab Procedure: Double Replacement Reactions Make sure your safety goggles are on!!!!! 2) Use masking tape and marker to label your eyedroppers and beakers for each of the six solutions. BaCl 2 ( aq ) CuSO 4 ( aq ) NaCl ( aq ) NaOH ( aq ) KI ( aq ) Pb (NO 3 ) 2 ( aq ) 3) Place 20 drops of each of the six stock solutions into each of the six labeled beakers on your bench. Caution: Don ’ t mixup the droppers for the stock solutions or the droppers at your bench!!! This will cause cross-contamination!!! 4) You will do 10 reactions using the watchglasses provided. Make sure to note which reaction you are doing and place 3-4 drops of each solution onto the watchglass . You may want to use a glass stirring rod to carefully stir the solution on the watchglass . 5) Observe and record your observations on the provided lab data sheet. 6) Once you are satisfied with the results, carefully rinse the watchglass off into your waste container and dry for another reaction. You have been supplied with several watchglasses so you can do several reactions at a time. Just make sure not to get your eyedroppers contaminated! 7) If you are not sure whether a reaction occurred or not, don ’ t be afraid to repeat that reaction. 8) When you are satisfied with all of your data, rinse all of your remaining solutions into your waste container and clean up your lab station. 9) Mr. Dressen will be doing an extra credit demonstration. Watch the demonstration and record your observations on your lab data sheet.

Slide 2:

Reactions to do Was there a reaction? Yes or No Observations BaCl 2 ( aq ) + CuSO 4 ( aq ) -----> BaCl 2 ( aq ) + NaCl ( aq ) -----> BaCl 2 ( aq ) + NaOH ( aq ) -----> Pb (NO 3 ) 2 ( aq ) + KI ( aq ) -----> Pb (NO 3 ) 2 ( aq ) + NaCl ( aq ) -----> Pb (NO 3 ) 2 ( aq ) + NaOH ( aq ) -  KI ( aq ) + CuSO 4 ( aq ) -----> KI ( aq ) + NaOH ( aq ) -----> CuSO 4 ( aq ) + NaCl ( aq ) -----> CuSO 4 ( aq ) + NaOH ( aq ) -----> Lab Data Sheet: Double Replacement Reactions Lab Bench # __________ Record the lab activities that you did here (i.e. labeled eyedroppers, cleaned watchglasses , did the BaCl 2 reactions, etc.): Additional experiment: Mr. Dressen took NaHCO 3 (baking soda) and heated it up. Record your observations at the bottom of this page as he does this demonstration. We studied 5 types of reactions … can you determine what type of reaction this is?