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Reaction rates (Testing Conditions (Temperature (Needs to remain constant…
Reaction rates
Safety
Material safety- care must be taken when using substances such as acid, if care is not taken then there could be a result in injury.
Even though you are taking care and that you are aware of the dangers of the materials accidents can still occur.
Decision, All options will increase the safety of the investigators
Human Safety
Eye Wear- wearing protective eye glasses helps prevent liquids getting into the eyes, therefore making the level of safety increase
Acid may get underneath the goggles because it is not guaranteed to protect you, this means that the eye could be burnt form the acid
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Lab Coats- wearing lab coats with help prevent substance getting onto clothes and skin, therefore causing the safety level to increase.
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Testing Conditions
Temperature
Needs to remain constant so that another variable cannot effect the results as temperature can either speed up or slow down the rate of reaction.
A limitation was not measured so that the temperature may not have remained completely constant throughout the experiment which could have effected the rate of reaction.
Concentration
Concentration will be changed a certain amount per tests so the effects on the rate of reaction can be measured
No obvious limitations, used for testing
Agitation
Agitation needs to remain constant, no agitation so that there is not an extra variable that could effect the results
There may have been an accidental agitation of the conical flask when the test was happening, this could have been unavoidable as accidents can occur. Agitation could have changed the rate of reaction, therefore adding another variable
How to measure
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The solutions used
Hydrochloric acid- put straight into the measuring cylinder. An eyedropper is used, which allows for very accurate measuring of the 10mL required. Will need to be consistent as the same amount is required in every test
If Hydrochloric Acid touches skin, small burns or irritations can be occur
All options are decisions in this section as all will allow for the test to be completed efficiently and effectively
Sodium Thiosulphate- needs to be poured from the container into a large beaker and then measured out into the measuring cylinder. must remain at a constant temperature to be consistent
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Gloves- The lack of gloves allow the substances to go onto our skin, decreasing the safety level.