1, answer "the work to be prepared before the experiment".

2. Make tables to record experimental phenomena and data. The experimental report is written in the white Basic Chemistry Experimental Report (I), which is divided into five parts: experimental purpose; Experimental principle; Experimental content; Experimental data and calculation results, as well as thinking and discussion.

Preview report

1. Answer the section "What should I prepare before the experiment"

Every analytical chemistry experiment has more or less a certain amount of calculation. The part of "preparation before experiment" is to solve these quantitative calculation problems and some key experimental operations. Answering this part can make us clear about the core problems of the experiment and the calculation flow of data processing, which is the only way for us to preview.

2. Experimental data record table

For every analytical chemistry experiment, there are a lot of data to be recorded and processed, and the process of making experimental phenomena and data recording tables is, in a sense, a preview of the experimental operation process, so such tables should be as clear as possible. Generally, there will be a suitable drawing method of the experimental platform on the blackboard of each laboratory.

laboratory report

1. experimental purpose part

The purpose of the experiment is to make clear what knowledge we can learn and master through this experiment. For example, in the experiment of "preparation and calibration of hydrochloric acid and sodium hydroxide solution", we need to master the specific steps and operation methods of preparing hydrochloric acid standard solution by indirect method, as well as the use of acid-base burette and the calibration of solution concentration.

When writing an experimental report, we need to number each experimental purpose and copy it one by one in the experimental report.

2. Experimental principle part

The experimental principle part needs to specify the basic chemical principle or analysis method of the experiment. For example, the experimental principle in the "complex" experiment is the coordination-dissociation equilibrium of the complex; The main experimental principle in the experiment of "Determination of Trace Impurity Iron in Disodium Hydrogen Phosphate" is Lambert-Beer Law. When writing an experimental report, you need to talk about the basic principle of this experiment, and focus on it in the report.

3. Experimental content part

This part requires us to write out the steps of the whole experiment in concise language after finishing the whole experiment. If you can easily complete this part, it means that you should be familiar with the whole process of the experiment. But don't be too lazy to omit any experimental steps because it will lead to mistakes in the whole experiment.

4. Experimental data and calculation results

Write and process the experimental data in the preview report, and get the final experimental results (experimental instructions, conclusions, etc. ) Through step-by-step calculation.

Thinking and discussing

This part is the last part of the whole experiment. After completing the whole experiment and processing the data, everyone needs to answer the corresponding thinking questions in the experimental textbook, and discuss the experimental phenomena and results (analyze the experimental results, the reasons for success or failure, the problems that should be paid attention to in the experiment, etc.). ).