凌迟

凌迟
充电
话题: , , 滴定法 页数: 5(1848字) 发布时间: 2014年8月10日
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充电

凌迟 在三个不同的实验中,镁带与盐酸发生反应,以确定金属离子上的电荷。在三个不同的过程中进行了多次测试之后,结晶方法被证明是通过使用摩尔比确定金属离子电荷的最佳方法。介绍

The objective of the Get Charged Up lab was to determine the charge on a metal ion reacting with HCl by determine the mole ratio in a reaction by determining the amount of excess reactant, amount of product, and amount of hydrogen gas produced as well as finding the best research method to determine the charge. To accomplish this, three different methods were used. Titration was used to react NaOH with HCl to determine the amount of H+ left over after the reaction is complete. Crystallization was used to determine the amount of MgCl? made after the reaction is done. Both of these methods allowed us to calculate the amount of H+ reacting with the amount of Mg. The gas law method and the Ideal Gas Law was also used to determine the mole ratio of magnesium metal to hydrochloric acid by measuring the amount of hydrogen gas based on the pressure and temperature changes during the reaction. With the results from each procedure, graphs were constructed and the most accurate and precise method was discernible. It is predicted that the titration method will be the most effect method of deterring a charge on a metal ion because almost all of the experiment done with titration is done by the experimenter and is the fairly easiest method. A titration is a method of analysis that will allow you to determine the precise endpoint of a reaction and therefore the precise quantity of reactant in the titration flask. Because of this precision, the titration method will be best for determining the charge of a metal ion because it is the most effective process. Method

三种不同的方法用于确定哪种方法最准确,最精确,用于确定与HCl反应的金属离子上的电荷。使用的第一种方法是滴定法。滴定是通过使一种物质与已知量的另一种物质反应来确定一种物质的量。在此实验室中,使用NaOH与HCl反应以确定反应完成后剩余的H +量。将镁带切成六块不同的块,并放入六个不同的烧杯中,然后使其与10.0 mL HCl反应。将指示剂添加到每个烧杯中,以确定溶液中何时仍存在H +。反应完成后,将每个烧杯用氢氧化钠(NaOH)滴定直至达到终点(指示剂的颜色变化)。使用Mg的质量,Mg的摩尔质量,NaOH的摩尔数和终点体积,可以计算出与Mg反应的H +的摩尔数。 (实际步骤可在实验室手册的第39-41页上找到。)用于确定Mg与HCl之间的摩尔比的第二种方法是生产固体形式的金属氯化物,以便对其进行称重。这称为结晶。称量六个不同的烧杯,将一块镁带切成各种质量(请参阅实验手册第42页),然后将其放入每个烧杯中。使用滴定管向每个烧杯中添加10.0 mL HCl,使其与指示剂(酚酞)反应,并使其完全完成。完成后,将每个烧杯放在热板上,并轻轻煮沸。将溶液煮沸,直到水和过量的HCl蒸发。记录每种产品(烧杯和晶体)的质量。在该过程结束时,计算出每个试验中所用的Mg摩尔数以及盐中Cl的摩尔数。 (实际步骤可在实验室手册的第42-44页上找到)气体定律方法是用于确定氢气量的第三种方法...


参考:Malina,Eric。 2013。通用化学实验室手册。
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