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Which test identifies sulfate ions? A A flame test B Adding a few drops of barium chloride solution C Adding a few drops of silver nitrate solution D Adding a few drops of sodium hydroxide solution Your answer - OCR Gateway - GCSE Chemistry - Question 4 - 2022 - Paper 1
Question 4
Which test identifies sulfate ions? A A flame test B Adding a few drops of barium chloride solution C Adding a few drops of silver nitrate solution D Adding a fe... show full transcript
Worked Solution & Example Answer:Which test identifies sulfate ions? A A flame test B Adding a few drops of barium chloride solution C Adding a few drops of silver nitrate solution D Adding a few drops of sodium hydroxide solution Your answer - OCR Gateway - GCSE Chemistry - Question 4 - 2022 - Paper 1
Step 1
Adding a few drops of barium chloride solution
Answer
To identify sulfate ions ( ext{SO}_4^{2-}), the most common test involves adding a few drops of barium chloride solution to the sample in question.
When barium chloride is added, a white precipitate of barium sulfate ( ext{BaSO}_4) is formed if sulfate ions are present. This reaction can be expressed as:
The formation of this white precipitate confirms the presence of sulfate ions.