Question detail
Which statement would earn credit for Carry out the sulfate ion test safely. (AT 8)?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
- A. Add barium chloride solution directly to the sample
- B. Acidify the sample with dilute hydrochloric acid
- C. Add sodium hydroxide to the sample
- D. Heat the sample before testing
Answer
The correct answer is Acidify the sample with dilute hydrochloric acid. It matches sulfate ion because the evidence is barium chloride after acidifying and the expected result is white precipitate.
Explanation
The correct option is Acidify the sample with dilute hydrochloric acid. The answer stays inside Identification of ions by chemical and spectroscopic means by linking the observation to the conclusion instead of naming a substance without evidence. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Safety Precautions in Sulfate Ion Test
Students often forget to acidify the sample before adding barium chloride solution, which is crucial for accurate results.
Always remember to acidify the sample with dilute hydrochloric acid before performing the sulfate ion test to ensure proper precipitation.
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