EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 復習筆記：2.7.3 Tests for Cations

Category: IGCSE課程, 國際課程, 教材筆記, 福利干貨 Date: 2022年11月15日下午3:24

EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 復習筆記：2.7.3 Tests for Cations

Tests for Cations

Metal cations in aqueous solution can be identified by the?colour?of the precipitate they form on addition of sodium hydroxide and ammonia
If only a small amount of NaOH is used then normally the?metal hydroxide?precipitates

?Analysing results

The table below contains the results for each of the cations included in the syllabus
If a precipitate is formed from NaOH then the hydroxide is insoluble in water

Testing for Cations Table

Exam Tip

Sometimes you may not see much of a precipitate because the cation you are testing is present is very small amounts. However, every a slight cloudiness or colour change can indicate a positive test result.

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