Investigating the effect of tempreture on the reaction between sodium thiosulphate and hydrochloric acid.

I will make this a fair test by using the same equipment. I will clean out the equimpment before I use a different solution in in to prevent premature reactions.I predict that the higher the temperature of the sodium thiosulphate the faster the reaction will take place.

A reaction takes place when a particle has enough energy when collided with a another particle to break the bonds and join. Not all collisions are successful. The higher the concentration the higher the chances of collision between particles. The higher temperature causes the atoms to vibrate faster which can cause the bonds holding them together to break.

The Apparatus I will use will be:

My aim in this experiment is to find which concentration of sodium thiosulphate is suitable for this experment. If the concentration of sodium thiosulphate is to strong the reaction will take place to fast and will be hard to take accurate results, this also applies if the concentration is to week. I will change the concentration of the sodium thiosulphate by adding distilled water. The amount of sodiumthiosulphate at any concentration has to equal 50cm3

For this experiment I will be using:

0cm3 of sodium thiosulphate (40 grames per liter)

40cm3 of distilled water

5cm3 of hydrochloric acid

I will chose a sutible number of measurements to take readinds in reaction tomes and to show clearly on graphs.

Predication

My predication is based on background scientific knowledge. I predict that the higher the temperature of sodium thiosulphate the faster the reaction will be. I know this because the heat energy will speed up the reactions taking place because heat makes the particles move faster thus more collisions.

Obtaining everdence

I will need to use the equipment propaley and safely.If I do not uses it right iw ill get in accurate results.The equipment contains acid which if spilt can cause damage to skin and eyes.

The apparatus I will use will be as accurate as possible. I will use burette instead of a measuring cylinder. The burette is accurate 0.1cm3 out of 50cm3.The measuring cylinder are a lot less accurate. All of the cylinder varies in accuracy. I will repete the experment 3 times to gain a accurate result.

My results

My results are as follows

Temperature

c?

Time (1)

Seconds

Time(2)

Seconds

Time (3)

Seconds

70°

5.2

6.3

4.5

60°

30.3

32.4

29.1

50°

45

49

47

40°

60.8

64.5

61.5

30°

94.3

98.7

02.6

20°

68

75

82

Rate of reaction

Tempture

c?

Rate of Reaction (1)

Rate of Reaction (2)

Rate of Reaction (3)

70°

0.065789

0.06135

0.068966

60°

0.033003

0.030864

0.034364

50°

0.022222

0.020408

0.021277

40°

0.016447

0.015504

0.01626

30°

0.010604

0.010132

0.009747

20°

0.005952

0.005714

0.005495

Results

Results

Andrew Larman