Reaction Rates Investigation

Reaction Rates Investigation Lab

     On Friday we conducted the Reaction Rates Investigation, where we tried to determine how certain variable changes affected the rate of reaction of Alka-Seltzer and water. Here is the information you will need to fill out the sheet that is due MONDAY.

Effect of Temperature on Reaction Rate

Procedure:

• Take out a tablet of Alka-Seltzer and weigh it on a scale. Record the weight.
• Fill up 1/2 of the cup with either Hot/Room Temp./Cold water (pick one per trial)
• Measure the temperature of the water in the cup
• Put a tablet of Alka-Seltzer into the cup, place the cover on, and flip over the cup.
• Time from the point the Alka-Seltzer comes into contact with the water to the point when it pops.
• Record the time in you're data table.
• Do this 2 more times with the 2 remaining temperatures of water

Data Table:

TRIAL 1 (Room Temp.Water)

Weight of Alka-Seltzer: 2.20 grams

Temperature of Water: 21.1 Degrees Celsius

Reaction Time: 10.22 seconds

TRIAL 2 (Hot Water)

Weight of Alka-Seltzer: 1.95 grams

Temperature of Water: 55.0 Degrees Celsius

Reaction Time: 2.8 seconds

TRIAL 3 (Cold Water)

Weight of Alka-Seltzer: 2.05 grams

Temperature of Water: 3.8 Degrees Celsius

Reaction Time: 40.57 seconds

Conclusion: Base your conclusion on you're observations of the effect temperature has on reaction 

Effect of Surface Area on Reaction Rate

Procedure: 

• Take out an Alka-Seltzer Tablet, and split it into 3 chunks, 1 chunk, or ground in a Mortar and Pestle
• Weigh the Alka-Seltzer, record.
• Fill up 1/2 of you're cup with Room Temp. water.
• Measure temperature of the water, record.
• Put the Alka-Seltzer into the cup, cover, and flip.
• Record the time it takes from contact to the pop of the cup.
• Do this two more times with the other surface area options.

Data Table:

TRIAL 1 (Ground)

-Weight of Alka-Seltzer: .93 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 11.36 seconds

TRIAL 2 (3 chunks)

-Weight of Alka-Seltzer: 1.01 grams

-Temperature of Water: 21.1 Degrees Celsius

-Reaction Time: 14.21 seconds

TRIAL 3 (1 Chunk)

-Weight of Alka-Seltzer: 0.99 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 18.45 seconds

Conclusion: Base your conclusion on you're observation of the relationship the different surface areas have on the reaction time.

Effect of Concentration of Reactants on Reaction Rate

Procedure:

• Take out a tablet of Alka-Seltzer, weigh it and record.
• Fill up either 1/4, 1/2, or a full cup with Room Temp. water
• Record the temperature of the water
• Place the tablet into the water, cover, and flip
• Record the time it takes for the cup to pop
• Do this two more times for the 2 other concentrations of water.

Data Table:

TRIAL 1 (1/4 Cup)

-Weight of Alka-Seltzer: 1.69 grams

-Temperature of Water: 20.6 Degrees Celsius

-Reaction Time: 11.6 seconds

TRIAL 2 (1/2 Cup)

-Weight of Alka-Seltzer: 1.66 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 13.25 seconds

TRIAL 3 (Full Cup)

-Weight of Alka-Seltzer: 1.72 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 8.3 seconds

Conclusion: Base your conclusion on you're observation of the effect changing the concentration has on reaction time. Our trial 3 may have been invalid considering the reaction time should have been longer than trial 1 and 2.

Homework

The packet that we filled about halfway on Thursday and this lab sheet are both due Monday. I didn't take a video of the pop, sorry ;(