How changing the concentration changes the rate of reaction. :: GCSE Chemistry Coursework Investigation

How changing the concentration changes the rate of reception.IntroductionWe are going to look at the following factors during thisinvestigation1 wherefore altering rate could be an advantage2 Good ideas to control the rate of reactions3 Briefly mention the factors that can change the rate of reaction such as -TemperatureSurface AreaCatalystConcentrationI am going to find out if changing the concentration of nitric battery-acid inwater and see if it has any effect on changing the rate of whichprecipitate is formed when reacts with sodium thiosulphate.PredictionI think that a faster reaction go forth happen with a higher acidconcentration as there will be more successful collisions with sodiumthiosulphate, which will result in a faster reaction because theproduct will be produced quicker. Apparatus1 Conical Flask2 Beakers3 Measuring CylindersPaper with a black cross on S pass bywatchNitric Acidsodium ThiosulphateWater Safety GlassesMethodFor my taste I will measure out 25cm of So dium Thiosulphate andput it in a conical flask. I will put the flask on top of a piece ofpaper that has a black cross drawn on it. I will then measure 15cm ofNitric Acid and enlarge this to the Sodium Thiosulphate in the conicalflask. The two should react together to make a cloudy precipitate andwe are going to time how long it takes for the politic to turn cloudyuntil we cant see the cross underneath the glass anymore. We aregoing to carry this experiment out a derive of times but each time wewill decrease the volume of Nitric Acid by 1cm and add 1cm of water.Each time we will decrease the Nitric Acid and increase the volume ofwater to see which one holds the fastest reaction. Our final amount ofNitric Acid should be 5cm and 10cm of water. I will repeat theexperiment 3 times to make sure that my results are as accurate asthey can be. I will then depict my results onto a graph so I cancompare them better and make a line of best-fit graph to show myresults even clearly.How will I make it a fair test?To make sure that my experiment is fair I will always use the sameamount of Sodium Thiosulphate and the only factor I will change willbe the volume of Nitric Acid and water but only to total 15cm so thedepth of the liquid will always be the same. Also, I will always usethe same conical flask and wash it out by and by every time I have usedit.EvaluationFirst of all we put our safety goggles on, and then we added 25cm3 of