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The aim of this investigation is to find which of the hydrated salts is best at providing water and to justify the choice made.

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Aim: The aim of this investigation is to find which of the hydrated salts is best at providing water and to justify the choice made. Key factors: * The variable that I will change will be the salt that I use in my experiment * The variable that will change will be the weight of salt after hydration and the amount of water lost when each salt is heated. Other factors: * Not over heating salt: I should not over heat the salt as it may start to decompose the salt. I will observe when to stop heating my salt i.e when all the water has evaporated. * Temperature of water: when I am rehydrating the salts I will need to make sure that each 10ml of tap water I use is the same temperature if it is not this will create unfair results. To check that it is all the same I will take the temperature of each 10ml I use. * Amount of water: In order to keep this a fair test I will need to make sure there is the same amount of water in each test tube I use, if I do not then I will get unfair results. ...read more.


Salt E however did need a larger amount of energy than salt D but due to its large amount of water being given off. If we were to take this into account then we would see on the whole that salt E needed the least amount of heat energy to release the most amount of water. Any compound, which contains water in the form of H20 molecules, is capable of dissolving; the best-known hydrates are those that are crystalline solids, which loose their basic structure on the removal of bound water. However, the reason that salt E was the best at providing water was because salt E is made of sodium which is an alkali earth metal this makes salt E soluble and combined with carbonate it becomes sodium carbonate (Na2Co3). Even though carbonates are insoluble, anything (compound) containing an alkali earth metal will be soluble. So if sodium carbonate (Na2Co3) were to be added to water it will readily dissolve. This explains why sodium carbonate, salt E was the best at providing water; because if you were to have a certain amount of water then more of salt E would dissolve in the water than salts B and D meaning that more of the salt could fit into a certain amount of water than the other two metals. ...read more.


If I were to make any changes the method then I would change the sentence which says "check that no water can be seen anywhere in the tube if there is warm to evaporate it" as I do not believe it is clear enough, it could say, " stop heating when all the steam has gone and reweigh". I would also change the part which says "allow to cool and reweigh". I believe this is very dangerous as someone may touch the test tube to make sure it is cool and if the it is still hot then it may burn him or her. I believe it needs to have a time limit as to when the test tube would be cool or instructions that say to take the temperature with a thermometer to make sure it is cool. I do not think that any further work can be done as I believe that the experiment produced a sufficient amount of evidence to base a firm conclusion on. If I were to do the experiment again I would make sure I had equipment that checked the accuracy of what I was doing. I would also do the experiment three times instead of twice as I could then calculate averages that could be extremely reliable. ...read more.

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