Which temperature does pure water freeze at under standard conditions?

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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

Which temperature does pure water freeze at under standard conditions?

Explanation:
The key idea is the freezing (melting) point of a substance at a given pressure. For pure water at standard atmospheric pressure (1 atm), this point is exactly 0°C, where ice and liquid water are in equilibrium. So under standard conditions, pure water begins to freeze at 0°C. If impurities are present, the freezing point drops a bit (freezing point depression), which is why impure water or salt solutions freeze at temperatures below 0°C.

The key idea is the freezing (melting) point of a substance at a given pressure. For pure water at standard atmospheric pressure (1 atm), this point is exactly 0°C, where ice and liquid water are in equilibrium. So under standard conditions, pure water begins to freeze at 0°C. If impurities are present, the freezing point drops a bit (freezing point depression), which is why impure water or salt solutions freeze at temperatures below 0°C.

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