Investigating the change of rate of reaction with change in concentration.

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Shozab Raza 10B

Investigating the change of rate of reaction with change in concentration

Aim:

To examine the effect the concentration of the reactants has on the rate at which they react (i.e. the rate of reaction).

Reactants and Products which will be investigated:

   Sodium        +    Hydrochloric                                   Sodium    +    Sulphur   +    Sulphur   +   Water

Thiosulphate               Acid                                         Chloride                               Dioxide

Na S O          +      2HCL                                      2NaCl     +      S          +     SO       +    H O                      

   

This reaction between sodium thiosulphate and hydrochloric acid (both colourless) yields a yellow precipitate of sulphur along with other by-products (e.g. water). Therefore using this knowledge we are able to investigate the effect various dilutions of the reactants (either sodium thiosulphate or hydrochloric acid) have on the rate at which they react.

During this investigation the concentration of sodium thiosulphate will be diluted while the concentration of other reactants will remain constant. The rate of at which the two reactants react will be indicated by the time in which the yellow-coloured sulphur is precipitated.

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Prediction:

Through moderate understanding I predict that the greatest concentration of either reactant should equate to a faster rate of reaction (i.e. a greater concentration of reactants should yield the yellow sulphur precipitate faster)

Variables:                                                        A                 B                    C        

INDEPENDANT- Concentration (sodium thiosulphate)    0.15mol/cm³   0.12mol/cm³   0.09mol/cm³                                                                                           ...

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