FACTORS INFLUENCE THE RATE OF A CHEMICAL

REACTION

Purpose : To know influnce that cause the rate of a chemical reaction

Basic Theory : The rate of a chemical reaction is influenced by : its concentration ,

surface are, temperature, and catalyst

Hypothesa : More broad this concentration, surface area, and temperature, thus

more large that’s rate of chemical reaction.

Tools & Ingridients :

1. Test tube

2. Stopwatch

3. Spyrtus

4. Burner of spyrtus

5. Thermometer

6. Stirring Spoon

7. Measure Glass

8. Paper with X mark

9. Cloride Acid (HCl) [ 0,1 M ; 0,5 M ; 1 M ]

10. Magnesium Ribbon (Mg) [ 3 ]

11. Calsium Carbonate (CaCO3) [ Powder ; Crystal ]

12. Na2S2O3 [ 25 mL ]

Working Way :

I. The Concentration

1. Cut of magnesium ribbon ( 2 cm )

2. Put Mg in 3 tube in various concentration of HCl solution

3. First test tube is filled HCl solution 0,1 M ; The second test tube is

filled 1 M ; The third test tube is filled HCl 2 M

4. Into Mg in each test tube in the some time

5. Calculate of time needed reaction of HCl and Mg

II. The Surface Area

1. Take 1 gram of powder and crystal of CaCO3 them put into test tube

2. Add 10 mL HCl solution 1 M into each test tube

3. Record the time needed by CaCO3 to react with HCl

III. The Temperature

1. Put 25 mL Na2S2O3 ( 0,2 M ) into two measure glass

2. Heat first measure glass until the temperature increase 100C

3. Then raise from burner of syrtus and is located at a table that in

measure glass that’s a paper with X mark

4. Doing the same work with the second glass but without burner firstly

5. Add 5 mL HCl ( 1 M ) into two measure glass in the same time

6. Record the time as X mark in the paper disappear

Result :

I. The Concentration

PROOF TABLE

Reactant Time of reaction (s)

Mg + HCL 0,1 M > 3600

Mg + Hcl 0,5 M 312

Mg + HCl 1 M 48

II. The Surface Area

PROOF TABLE

Reactant Time of reaction (s)

CaCO3 powder + HCl 10 mL 10

CaCO3 crystal + HCl 10 mL 168

III. The Temperature

PROOF TABLE

Reactant Initial Temperature End Temperature Time of reaction (s)

Na2S2O3 + HCL 5 mL 310 C 410 C 9

Na2S2O3 + HCL 5 mL 310 C 310 C 13

QUESTION

1. From the experiment above :

a. Indeendent variable

b. Dependent variable

c. Control variable

2. What time to need of reaction ?

a. The first reaction second

b. The second reaction second

c. The third reaction second

3. Put in to order the easiness to dissolved of CaCO3 in HCl ?

4. What do you conclude ?