Also whilst changing the concentration it is vital that all other variables remain consistent throughout the experiment.I will not be using room temperature as I cannot control it and this could cause improbabilities within my investigation. Middle 25cm3, 20cm3 etc from the burette into a test tube * Next measure out the amount of water that was needed e.g. * Put both of the test tubes into a test tube rack.
Also whilst changing the concentration it is vital that all other variables remain consistent throughout the experiment.
Therefore rate of reaction increases with increasing temperature.
At low temperatures the reacting particles have less energy. The gaining of energy enables the particles to move around quicker, this increases their chance of colliding but also, the increase in energy increases the possibility of a collision occurring with sufficient energy.
The factors to discuss might be: amount of limestone? (1) its the hydrogen ion, H (aq), is the active ingredient that actually 'attacks' the metal or carbonate, and acids can ionise to different extents, (2) 1 molar or 1 mol dm-3 (1M) H2SO4 is twice as acid as 1M HCl because each H2SO4 provides 2 H 's whereas each HCl just 1.
If you have decided, for example, to investigate the effect of acid concentration on the speed of a reaction, then everything else should be kept constant for a fair test, and this should be obvious in your plan for the reasons discussed above!
Introduction Chemistry Plan I am going to produce a piece of coursework investigating the rate of reaction, selecting a variable to see how this affects the rate.
The rate of reaction is the rate of loss of a reactant or the rate of formation of a product.
Hence, these results show that an increase in concentration increases the rate of a reaction.
As you can see, the greater the concentration of the acid used in a reaction the steeper the curve and the shorter the reaction time.
* Put the test tube rack into the water bath at a temperature of 40o C so the temperature doesn't affect the results as it is also a variable.
* Wait ten minutes to insure that both of the substances are at 40o C.