为了让学生感受反应物的浓度对反应速率的影响,人教版高中化学选修4《化学反应原理》20面实验2-2通过0.2 mol/L的草酸溶液较0.1 mol/L的草酸溶液与酸性高锰酸钾溶液反应时,褪色需要的时间短,体会增大反应物的浓度,反应速率会加快。是否草酸的浓度越大,与酸性高锰酸钾溶液反应的速率就会越快呢?本文分别研究了一系列不同浓度的草酸溶液与同体积、同浓度的酸性高锰酸钾溶液反应时的反应速率,结果发现:并不是如教材中所说浓度越大,反应速率越快,此实验 In order to let the students feel the influence of reactant concentration on the reaction rate, People’s Education High School Chemistry Elective 4 “chemical reaction principle” 20 surface experiments 2-2 by 0.2 mol / L oxalic acid solution compared with 0.1 mol / L oxalic acid solution and acid When potassium permanganate solution is used for reaction, the time required for fading is short, and when the concentration of the reactant is increased, the reaction rate will be accelerated. Whether the oxalate concentration is higher, the rate of reaction with acidic potassium permanganate solution will be faster. In this paper, a series of different concentrations of oxalic acid solution with the same volume, the same concentration of acid potassium permanganate solution reaction Reaction rate, the results found that: not as stated in the textbook, the greater the concentration, the faster the reaction rate, this experiment