Which temperature does pure water boil 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 boil at under standard conditions?

Explanation:
Boiling occurs when the liquid’s vapor pressure equals the surrounding pressure. At standard conditions, the surrounding pressure is 1 atmosphere (about 101 kPa). For pure water under that pressure, the temperature at which it boils is 100°C, when bubbles form throughout the liquid. The other temperatures would correspond to different pressures: lower pressures boil at temperatures below 100°C, higher pressures raise the boiling point above 100°C.

Boiling occurs when the liquid’s vapor pressure equals the surrounding pressure. At standard conditions, the surrounding pressure is 1 atmosphere (about 101 kPa). For pure water under that pressure, the temperature at which it boils is 100°C, when bubbles form throughout the liquid. The other temperatures would correspond to different pressures: lower pressures boil at temperatures below 100°C, higher pressures raise the boiling point above 100°C.

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