March 14, 2014

MARCH 14, 2014

Alka-Seltzer Lab

Effect of Temperature on Reaction Rate:

Procedure: (1 example)

1. Constant: 1/2 of the film canister is filled with water (for every experiment's procedure!)

2.  First experiment was with room temperature water. Second procedure was with cold water. Third procedure was with hot water.

3. We measured the temperature of the water in the film canister.

4. We broke an alka-seltzer tablet in half and measured the mass. 

5. We put the measured alka-seltzert half and quickly put the alka-seltzer in the film canister, closed the film canister with the cap, and turned the film canister up-side down. 

4. Right when we flipped it we started timing (this all happens really fast, so while a partner is flipping we started timing)

5. Right when the flim popped, because of the pressure, we stopped the timer. We recorded the time in our data table. 

6. We did this for the rest if the water temperatures.

Data Table:

Temperature experiment:

Room temperature water:

Water temp: 25.9 degrees Celsius

Grams of half of one alka-seltzer tablet: 1.731 grams

Time it took to pop: 10.51 seconds

Cold water:

Temp of water: 4.6 degrees Celsius

Grams of 1/2 of alka-seltzer tablet: 1.783 grams

Time to pop: 22.10 seconds

Hot water:

Temp of water: 58.0 degrees Celsius

Grams of 1/2 alka-seltzer tablet: 1.457 grams

Time to pop: 3.05 seconds

Effect of Surface area:

*Room temperature water as constant*

*Water is still 1/2 of film canister*

Half of 1 aka-seltzer tablet: 1.384 grams

Temp of water: 25.4 degrees Celsius

Time it took to pop: 13.07 seconds

Two 1/4ths of alka-seltzer tablet: 1.495 grams

Temp of water: 25.1 degrees Celsius

Time it took to pop: 13.13 seconds

Crushed 1/2 alka-seltzer: 1.748 grams

Temp of water: 24.8 degrees Celsius

Time it took to pop: 5.71 seconds

Effect of Concentration:

*Room temperature water: as constant*

*Water filled up to1/2 of film canister*

1 alka-seltzer tablet: 3.234 grams

Water temperature: 24.1 degrees Celsius

Time to pop: 5.20 seconds

1/2 of an alka-seltzer tablet: 1.852 grams

Water temperature: 23.7 degrees Celsius

Time to pop: 12.68 seconds

1 1/2 alka-seltzer tablets: 5.153 grams

Water temperature: 23.7 degrees Celsius

Time it took to pop: 5.51 seconds

HOMEWORK:

Finish the lab worksheet! Due Moday!

Finish the Rate Expressions and Rate Constants packet! Due Monday!

WE DO NOT HAVE ANY WEBASSIGNS! :)