rates of reaction

Experiment 1      investigating the effects of temperature on reaction rate.


Aim : 
i want to investigate how temperature effects the reaction rate.


equipment
-conical flask
-beaker
-measuring cylinder
-stopwatch
-water bath
-paper with a black cross X
-0.1mol/L sodium thiosulfate
-2.0mol/L hydrochloric acid

method
1. put the X paper on bench mat, put the conical flask on top of the paper
2. measure 50ml of sodium thiosulfate solution ,put it into the beaker
3. record the temp of the sodium thiosulfate
4. measure 50ml of HCL , pour this into the conical flask
5. pour sodium  thioslfate into the conical flask , start the stopwatch and swirl the flask . Time how long it takes for the cross to disappear when viewed from above.
6. wash out the flask thoroughly.
7. repeat the experiment ,using a watch bath to heat the sodium thiosulfate to 30degrees then 40 degrees and then 50 degrees.keep the volume of acid the same each time.


result:
room temp , 31s
30 degrees
40 degrees
50 degrees

Experiment 2:        Investigating the Effects of Concentration on Reaction Rates.

Aim:  I want to investigate how temperature effects the reaction rate.

Equipment:

• conical flask
• measuring cylinder
• stopwatch
• black cross on paper
• 0.2 mol/L sodium thiosulfate
• 1.0 mol/L hydrochloric acid (HCL)

Method: 

1.  Put 'X' on paper on the bench mat, and put the conical flask on top of paper.
2. measure 10 ml of sodium thiosulfate solution and put it into the conical flask.
3. measure 40 mls of water and put into the conical flask. Then swirl the flask to mix the contents.
4. measure 5 ml of HCL and pour this into the conical flask, start the stopwatch and swirl the flask and time how long it takes for the cross to disappear. 
5. wash out the flask thoroughly repeat the experiment using the other volumes of sodium thiosulfate and water in the table on the right. keep the volume of acid the same each time. 

10mL Thiosulfate/40mL Water took 18 mins & 35 seconds for the X to disappear.
20mL Thiosulfate/30mL Water took 54 seconds for the X to disappear.
30mL Thiosulfate/20mL Water took 1 min 26 seconds for the X to disappear.
40mL Thiosulfate/10mL Water took 24 seconds for the X to disappear.
50mL Thiosulfate/0mL Water took 51 seconds for the X to disappear.

Experiment3: observing the effects of surface ares on reaction rate 

Aim:

To make simple observations during a reaction between calcium carbonate (CaCO3) chips and power , with hydrochloric acid (HCL).

Equipment: 

-boiling tube,

-calcium carbonate chips  and powder 

 -hydrochoric acid 

 -measuring cylinder spatula 

method

1. measure 2ml of hydrochloric acid and pour this into your boiling tube.

2.holding your boiling tube over a sink or heatproof mat, add a pea-size amount of calcium  carbonate powder to your boiling tube. record your observations below.

3. Repeat the experiment, but this time use a chip of calcium carbonate that is roughly the same size as the spatula of powder you used previously. Record your observations below.

observation of powder CaCO3= 

It bubbled up and the hydrochloric acid went cloudy.

observation of CaCO3 chip =
It fizzing up and the hydrochloric acid went cloudy



experiment 4 catalysts 

AIM:
observer the effects of a copper catalyst on the reaction between zine and sulfate acid.


equipment 
- There test tubes
-test tube rack
-10ml  measuring cylinder
-dropping pipette
-granulated zinc
-copper turning or powder
-dilute sulfuric acid (H2SO4)


 Method:

1.  Add roughly the same mass of zinc test tubes 1 and 3.

2.  Add roughly the same mass of copper to test tubes 2 and 3. 

3.  Add 5 mL of dilute sulfuric acid to test tube 1. Note the rate of production of gas bubbles.

4.  Add 5 mL of the acid to test tube 2. Note the rate of production of gas bubbles.

5.  Add 5 mL of the acid to test tube 3. Note the rate of production of gas bubbles.

Observations 

Test tube 1

Zinc and Acid 

it fizzed 

Test tube 2

Copper and Acid 

it bubbled 

Test tube 3 

Zinc, Copper and Acid 

little bubble but after that nothing