5 Graph for results for rate of reaction against temperature

6 Graph of results for rate of reaction against time

8 Graph and table of typical results

This investigation is about Rates of Reaction and what affects them. In this case I am going to look at hydrochloric acid and sodium thiosulphate, which is a precipitation reaction. I will be investigating whether a change in temperature affects the rate of reaction.

Sodium thiosulphate and hydrochloric acid react together to produce sodium chloride, sulphur dioxide, water and sulphur. This is also shown in the word and symbol equations below:

Sodium thiosulphate + Hydrochloric acid cSodium chloride + sulphur dioxide + water + sulphur

Na2S2O3(aq) + 2HCl(aq) -* 2NaCl(aq) + S(s) + SO2(g) + H2O(l)

Both of these solutions are colourless. They react to produce a solid (sulphur, which is the yellow precipitate), and as it cannot dissolve in water, the soluti

Time (2) for the cross to become obscured Average Rate of reaction

4) Increasing the concentration -- A more concentrated solution will contain more of the same particles, which will be more tightly packed. So, once again, there will be a much greater chance of successful collisions between the particles (In this case, this reaction is exothermic, as it gives out energy)

The temperature of the sodium thiosulphate was not measured. The colder acid may have bought down the temperature of the hydrochloric acid.

20 30 0.06m 5 154.36s 153.09s 153.73s 0.0065s

To be able to compare the concentration and temperature even further, we should also have used 0.15 molars of sodium thiosulphate. This would have made the test fairer.

I will have to consider safety precautions, so I will wear goggles, and tie my hair back to prevent any hazards. I will also have to make sure the apparatus is stable.

Some common words found in the essay are:
Symbol Na2S2O3aq, Comparing Jugal's, Average Rate, Page Title, rate reaction, Planning Sodium, Rates Reaction, Word Sodium, sodium thiosulphate, Results Below, Na2S2O3 Volume, Volume Acid, hydrochloric acid, 025 25, 025 25 5, activation energy, 25 5, cross obscured, typical results, temperature increased, rate reaction increase, reaction increase, increased rate reaction, results rate reaction, concentration sodium thiosulphate,
Approximate Word count = 1795
Approximate Pages = 7 (250 words per page double spaced)