Wednesday, May 29, 2019
How Concentration affects the rate of reaction :: GCSE Chemistry Coursework Investigation
How Concentration affects the rate of answerI am investigating the rates of reaction and how the differentvariables can affect it. I know that the temperature, a catalyst,concentration, the surface area, light and pressure of a gas canaffect the rate of reaction. In this particular prove I am goingto investigate on how the concentration of one of the reactantsaffects the rate of reaction.To show that the concentration does affect the rate of reaction I amgoing to carry out the reaction of sodium thiosulphate andhydrochloric astringent. The reactant I am going to change in concentrationfor each experiment/reading is sodium thiosulphate.Word EquationSodium + Hydrochloric Sodium + Sulphur + water + SulphurThiosulphate sultry Chloride dioxideChemical Equation=================Na2S2O3(aq) + 2HCl(aq) - 2NaCl(aq) + S(s) + H2O(l) + SO2(g)Equipment=========Sodium Thiosulphate (NaSO) of different concentrations and volumes5cm Hydrochloric acid (HCl)Water of different volumesPaper marked w ith a cross2 Measuring cylindersConical FlaskStopclockI will set the equipment up as shown in the diagram belowMethodI am going to measure out the right amount (50cm) and concentrationsof the sodium thiosulphate and hydrochloric acid. I will castrate theconcentration of the sodium thiosulphate but will still keep thevolume of the acid the same. I will keep the volume (5cm) andconcentration (2.0 moi/dm) of the hydrochloric acid the same.The table below shows the amount of water I will add to the sodiumthiosulphate to vary the concentration in each experiment.---------------------------------------------------------------------------------Experiment Volume of 0.15 gram molecule/dm (cm) Volume of water Concentration sodium Number sodium thiosulphate (cm (Cm) thiosulphate solution (mol/dm) 1 50 0 0.15 2 40 10 0.
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