Investigating Rates of Reaction
HCL(aq)+Na2S203(aq) = 2NaCl(aq)+SO2(g)+S(s)+H2O(l)
Effects
To investigate the concentration of sodium thiosulphate solution we need to look at the factors affecting rate of reaction.
Temperature
When the temperature is increased the rate of reaction speeds up.
When the temperature decreases the rate of reaction slows down.
Concentration
When the concentration increases the rate of reaction increases.
When the concentration decreases the rate of reaction decreases.
Light Intensity
When the light intensity increases the rate of reaction increases.
When the light intensity decreases the rate of reaction decreases.
But light intensity only affects rate or reaction in photosensitive reactions; this reaction is not so therefore light intensity is not a factor we have to consider.
Catalyst
This provides a different route with a lower activation energy. But in this experiment there is no known catalyst, so we don't need to consider this factor,
Surface Area
When the surface area increases, the rate of reaction also increases, as there are more particles. But this is only in solids so this also is not a factor we need to consider, as neither reactants are solids.
Pressure
Neither reactants are gases, so pressure has no effect.
?Both solutions are colourless and water is also colourless so we can't measure colour change.
?SO2 is soluble in water, so we can't measure that.
?Sulphur appears as a yellow precipitate.
?The only thing we can do is time it for how long it will take for a marker to disappear.
Safety
HCL is corrosive so we must take care when using it. If it spills we must wash are hands if it came in contact and clear away immediately the surface.
Sodium Salt has minimal hazards, but it is harmful if ingested in quantity,
Sodium Dioxide is toxic, corrosive and poisonous so great care must be taken when using it.
Lab coats, lab coats and long hair must be tied back when using any of these substances.
Preliminary Experiment
We must find the best temperature and the volume and concentration of hydrochloric acid and sodium thiosulphate we need to use to carry out are investigation.
Heating acids is dangerous so we must not exceed 60oC
HCL(aq)+Na2S203(aq) = 2NaCl(aq)+SO2(g)+S(s)+H2O(l)
Effects
To investigate the concentration of sodium thiosulphate solution we need to look at the factors affecting rate of reaction.
Temperature
When the temperature is increased the rate of reaction speeds up.
When the temperature decreases the rate of reaction slows down.
Concentration
When the concentration increases the rate of reaction increases.
When the concentration decreases the rate of reaction decreases.
Light Intensity
When the light intensity increases the rate of reaction increases.
When the light intensity decreases the rate of reaction decreases.
But light intensity only affects rate or reaction in photosensitive reactions; this reaction is not so therefore light intensity is not a factor we have to consider.
Catalyst
This provides a different route with a lower activation energy. But in this experiment there is no known catalyst, so we don't need to consider this factor,
Surface Area
When the surface area increases, the rate of reaction also increases, as there are more particles. But this is only in solids so this also is not a factor we need to consider, as neither reactants are solids.
Pressure
Neither reactants are gases, so pressure has no effect.
?Both solutions are colourless and water is also colourless so we can't measure colour change.
?SO2 is soluble in water, so we can't measure that.
?Sulphur appears as a yellow precipitate.
?The only thing we can do is time it for how long it will take for a marker to disappear.
Safety
HCL is corrosive so we must take care when using it. If it spills we must wash are hands if it came in contact and clear away immediately the surface.
Sodium Salt has minimal hazards, but it is harmful if ingested in quantity,
Sodium Dioxide is toxic, corrosive and poisonous so great care must be taken when using it.
Lab coats, lab coats and long hair must be tied back when using any of these substances.
Preliminary Experiment
We must find the best temperature and the volume and concentration of hydrochloric acid and sodium thiosulphate we need to use to carry out are investigation.
Heating acids is dangerous so we must not exceed 60oC