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Molarity of water

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Calculate the molarity of one litre of water.

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This is a question that is often seen as a bonus question on exams and quizzes. It is also a fun little question/solution that can be used to show off your knowledge of chemistry and calculations. The solution explains how the answer was achieved and why the answer is not as simple as you might think.

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What is the Molarity of one litre of water?

First let us assume that it is pure water and that the only chemicals present are hydrogen and oxygen. We need to find the moles and litres of water to calculate the Molarity. Simple enough, right? In fact, since concentration is constant for a given solution, no matter how much of ...

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