Question detail
Describe the procedure to identify the presence of iron(II) ions in a solution using a test-tube reaction.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
A-level practical endorsement and required practical activities
Question
Describe the procedure to identify the presence of iron(II) ions in a solution using a test-tube reaction.
Answer
To identify iron(II) ions, add a few drops of dilute sodium hydroxide solution to the sample. A green precipitate of iron(II) hydroxide will form, indicating the presence of iron(II) ions. This answer is anchored to A-level required practical activities.
Explanation
To identify iron(II) ions, add a few drops of dilute sodium hydroxide solution to the sample. A green precipitate of iron(II) hydroxide will form, indicating the presence of iron(II) ions. is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 11: carry out simple test-tube reactions to identify transition-metal ions. This reasoning is anchored to A-level required practical activities in A-level practical endorsement and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Identifying Transition-Metal Ions
Students often confuse the test observations for different transition-metal ions, leading to incorrect identification.
To accurately identify transition-metal ions, remember the specific reagents and the expected color changes. For example, adding sodium hydroxide to a solution containing copper(II) ions will produce a blue precipitate of copper(II) hydroxide. Always write down the expected observation and compare it to the actual result. Keep the correction anchored to A-level required practical activities and the objective: Required practical 11: carry out simple test-tube reactions to identify transition-metal ions.
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