BioMedical Admissions Test (BMAT) 2025 – 400 Free Practice Questions to Pass the Exam

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How can sulfate ions be tested in a solution?

Add BaCl2 only

Add dilute HCl followed by BaCl2

To test for the presence of sulfate ions in a solution, the method involves adding dilute hydrochloric acid (HCl) followed by barium chloride (BaCl2). When you add dilute HCl, it serves to eliminate any potential interference from carbonate ions that could lead to the precipitation of barium carbonate instead of barium sulfate.

After the addition of hydrochloric acid, barium chloride is added. Sulfate ions will react with barium ions to form barium sulfate (BaSO4), which is a white precipitate. The formation of this precipitate is a clear and confirmatory test for the presence of sulfate ions in the solution.

This dual-step process ensures that the results are specific to sulfate ions, distinguishing them from other anions that might be present, such as carbonates or phosphates. The clarity and reliability of the precipitate formed in this test make it a standard approach in qualitative analysis for sulfate detection.

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Add concentrated HCl

Bubble CO2 through the solution

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