Volumetric analysis is the common method in determining the amount of hypochlorite or free chlorine in bleach. From the following website, you can find another suggestion for analysing the chlorine content of swimming pool water or bleach - using a colorimeter (Experiment 9.1). This is a good idea for students to carry out a scientific investigation on analysing chlorine content of swimming pool water or bleach using either instrumental method or quantitative method, or both.

Reference website: http://chemistry.slss.ie/ch_mandatoryexperiments.html

The experimental manual: colorimetric-experiment-on-swimming-pool-water.doc

示範如何提取有用的物質
Demonstrate how to extract useful substance

Video Clip

Content:
Using a mortar and pestle to grind solid into powder; folding a fluted filter paper; dissolving the aspirin powder; filter a hot and saturated solutions; crystallization; carrying out suction filtration; taking solid out from the Buchner funnel; preparing a melting point tube; introducing solid into a melting point tube; using a melting point apparatus to determine the m.p. of a purified solid.

以氫氯酸滴定碳酸鈉為例，示範酸鹼滴定的過程
Demonstration of the process of an acid-base titration using hydrochloric acid and sodium carbonate (18.44 mins)

Video Clip

Content:
Dissolving the solute in a beaker; transferring the solution to the volumetric flask; making up the mark; homogeneous mixing of the prepared solution; rinsing a burette with distilled water; rinsing a burette with titrant; filling a burette with titrant; rinsing a pipette with distilled water; filling a pipette; delivering liquid from a pipette; carrying out the trial titration; doing a more accurate titration.

焰色試驗錄影片段
Flame test video clip (4.5 mins)

Video clip

Content:
Equipment for flame test; Cleaning a platinum wire; conducting the flame test; comparing the characteristics flame colours of sodium and potassium; flame colours of stronium, barium, lead, iron, calcium and copper.

適合高級程度化學及新高中化學課程分析化學使用的多媒體學習軟件，網址如下。

 http://resources.edb.gov.hk/chemtech

1. 指引及習作 和 參考答案 (需要密碼)

2. Introduction & Exercises and Solution (Password Required)