篇一 :英文版化学实验报告

Preparation of ethyl acetate

First, thepurpose of the experiment:

1、    Learn from the general principles of organic synthetic esters and methods

2、    Master distillation, extraction, drying and other experimental techniques and its application in a specific experiment

Second, theexperimental principle:

   Main reaction

       CH3COOH+CH3CH2OH=CH3COOCH2CH3+H2O

     Conditions: heating to 120 to 125 °C in concentrated sulfuric acid catalyzed

  Side effects

                     浓H2SO4
CH3CH2OH--------->CH2=CH2+H2O

                            170度 

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篇二 :英文版化学实验报告

Determination of sodium chloride in saline

Purpose

Learning Silver nitrate standard solution preparation and calibration methods

Master Fajans method for the determination of chloride ions principle

Principle

In the PH value of 7-10.5, with fluorescent yellow as indicator, titration with AgNO3 standard chloride solution. Fluorescent yellow first dissociation in solution

HFIn    ====    H++FIn?

Before the end of excess chloride ions, chloride ions adsorbed silver chloride precipitation, the negatively charged surface, the equivalence point of excess silver ions to precipitate silver ions adsorbed positively charged surface. Precipitation of positively charged anion adsorption fluorescent yellow indicator dissociated, the configuration time change colors green and yellow to pink.

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篇三 :英文版化学实验报告

Preparation of n-bromobutane

一、Purpose

1、Study the principle and method of preparing n-butyl bromide from n-butyl alcohol by treatment with sodium bromide and concentrated sulfuric acid

2、Learn the technique of reflux with a gas trap apparatus and washing.

二、Principle

n-Butyl bromide can be easily prepared by allowing n-butyl alcohto react with sodium bromide and concentrated sulfuric acid.

Main reactions :

NaBr + H2SO4 → HBr + NaHSO4

Secondary reactions:

三、Materials

n-butyl alcohol:4mL

Sodium bromide:5g

Concentrated sulfuric acid:2.5mL/6mL

Anhydrous calcium chloride:0.5g

10% aqueous sodium hydroxide:5mL

Primary reagent And Product physical constants

五、Apparatus

                       

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篇四 :英文版化学实验报告

Title: Preparation of Fe scrap from waste

(NH4) 2SO4.FeSO4.6H2O

The purpose of the experiment

Learn the method used scrap iron preparation of ferrous ammonium sulfate.

Familiar with the water bath, filtered, and evaporated under reduced pressure and crystallization basic working.

The experimental principle, the iron and sulfuric acid to generate reactive ferrous sulfate, ferrous sulfate and ammonium sulfate in an aqueous solution of equal molar interaction, becomes less soluble blue generate ferrous ammonium sulfate.

Fe+H2SO4=FeSO4+H2 (gas)

FeSO4+ (NH4)2SO4+6H2O=(NH4)2SO4.FeSO4.6H2O Usually ferrous rocks are easily oxidized in air, but after the formation of relatively stable perfunctory, not to be oxidized.

Experiment to use instruments, scales, constant temperature water bath, pumps, basins, cups, 10ml graduated cylinder, asbestos mesh, glass, tripod, alcohol lamp, funnel.

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篇五 :英文版化学实验报告

The preparation of alkali type copper carbonate

The first:the experiment purpose

1.Master the methods of alkali type copper carbonate prepared and principle

2.Through the design experiment to cultivate independent design ability and chemical research thinking

The second:the experimental principle

The solubility of Cu(OH)2and CuCO3 are similar, With Cu2(OH)2CO3 solid precipitation in the solution.

2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO2

The third:the experimental steps

1.Solution preparation

Disposes 0.5 mole of each litre acid sour coppers and sodium carbonate solution each 100 milliliters.

2.The feeding order and raw material compare the exploration

According to 2:1.6,2:2,2:2.4,2:2.8 allocated proportion, is accepted after passing an examination the surface disposition acid sour copper and the sodium carbonate solution, joins in separately 8 test tubes, joins rapidly the sulfuric acid copper solutions in the sodium carbonate solution, vibrates about other constant temperature ten minutes as for 75 degrees Celsius water baths in, the inversion feeding order recreates one time, the observation has the precipitation speed, quantity how many and the color, discovers the optimum condition.

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篇六 :英文版化学实验报告

Preparation of Ethyl Acetate

I.Experimental Objective

1. To grasp the esterification reaction principle and methods of preparation of ethyl acetate from acetic acid and ethanol.

2. To learn to reflow method on the reaction.

3.To review the use of distillation, separating funnel, basic operations, such as washing and drying of the liquid.

II. Principle of the Test

This experiment regarded glacial acetic acid and ethanol as raw material, it adopted the ethanol overdose and the suction effect of concentrated sulfuric acid to make the reaction goes smoothly.In addition to generating the main reaction of ethyl acetate, there is generated a side reaction of diethyl ether .

Primary reactions:

CHCHCHCOOH323+浓HSO24

?HOCHCOOCHCH2323+

Side reactions:

CHCH32浓HSO170 CoHHC22O+H2

2(CHCH)322浓HSO140 oC(CHCH)O322HO2+

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篇七 :化学实验报告

东塔学校化学实验报告

班级           姓名           同组人          指导教师  史老师   

日期:            实验题目:观察和描述一对蜡烛及期燃烧的探究    

实验目的:

1、培养观察和描述的能力。

2、学习科学探究的方法。

实验器材:

蜡烛、小木条、烧杯2个、澄清石灰水

实验步骤:

    1、点燃前,观察蜡烛的颜色、状态、形状和硬度;观察把蜡烛投入水中的情况。

2、燃着时,火焰分几层,用小木条比较火焰不同部分温度的高低,用烧杯推测燃烧后的生成物。

3、燃灭后,用火柴去点白烟,蜡烛能否重新燃烧。

现象:

    1、蜡烛是乳白色,柱状固体、无味,能被轻易切成处,放于水中飘浮于水面上。

2、火焰分为三层。小木条上外焰接触的部分被烧焦得最厉害,干燥的烧杯内壁有水珠,涂有石灰水的烧杯变浑浊。

3、白烟能被点燃。

分析及结论:

1、蜡烛难溶于水、质软。

2、外焰温度最高,蜡烛燃烧有水和CO2生成。

3、吹灭蜡烛后的白烟是可燃物。

东塔学校化学实验报告

班级           姓名           同组人          指导教师  史老师   

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篇八 :化工原理实验氨吸收实验报告英文版

Lab 5 Experiment of Absorption

I. Objectives

1. Understand the configuration of an absorption column

2. Determine the overall volumetric gas phase mass transfer coefficient , KYα

3. Understand the characteristics of single-film resistance.

II. Principles

   In gas absorption process, a solute component is absorbed by contacting with a liquid phase, in which the component is soluble. In this experiment, water is used to remove ammonia from air. The absorption of NH3 in water is gas phase controlled. The gas phase coefficient approximately equals to the overall mass-transfer coefficient. Based on this, the overall volumetric mass-transfer coefficient can be evaluated.

   When the mole fraction of solute in liquid is less than 10%, the equilibrium correlation obeys Henry’s law. The overall mass-transfer coefficient is

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