What is the chemical formula for bromine water in solution?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the chemical formula for bromine water in solution?

Explanation:
When a substance is described as bromine water, it means bromine is dissolved in water, forming an aqueous solution. The correct way to write this is Br2(aq) because it represents bromine molecules still present as Br2 inside the water, with the (aq) indicating the dissolved state. The other options refer to different forms: bromine gas is Br2(g) and isn’t a solution, pure liquid bromine would be Br2 without a state, and Br3− is a polyhalide ion that isn’t the standard description of bromine dissolved in water. In water, bromine can partly hydrolyze to species like HOBr and HBr, but the common way to denote the dissolved bromine itself is Br2(aq).

When a substance is described as bromine water, it means bromine is dissolved in water, forming an aqueous solution. The correct way to write this is Br2(aq) because it represents bromine molecules still present as Br2 inside the water, with the (aq) indicating the dissolved state. The other options refer to different forms: bromine gas is Br2(g) and isn’t a solution, pure liquid bromine would be Br2 without a state, and Br3− is a polyhalide ion that isn’t the standard description of bromine dissolved in water. In water, bromine can partly hydrolyze to species like HOBr and HBr, but the common way to denote the dissolved bromine itself is Br2(aq).

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