**This boiling point calculator is a valuable tool in chemistry designed to compute the temperature at which a liquid transitions to a gas at a specific pressure. **

This calculator takes into account various factors that influence boiling point, such as **atmospheric pressure**, **altitude**, and the **properties** of the substance in question.

## Boiling Point Calculator

Substance | Pressure (atm) | Calculated Boiling Point (°C) |
---|---|---|

Water | 1.0 | 100.0 |

Water | 0.9 | 96.6 |

Water | 0.8 | 92.5 |

Water | 0.7 | 88.3 |

Water | 0.5 | 81.3 |

Ethanol | 1.0 | 78.4 |

Ethanol | 1.2 | 82.5 |

Ethanol | 1.5 | 89.7 |

Ethanol | 0.8 | 70.5 |

Acetone | 1.0 | 56.1 |

Acetone | 0.9 | 54.2 |

Acetone | 0.8 | 49.2 |

Acetone | 0.6 | 43.7 |

Hexane | 1.0 | 68.7 |

Hexane | 0.9 | 66.5 |

Hexane | 0.8 | 64.3 |

Benzene | 1.0 | 80.1 |

Benzene | 0.9 | 77.6 |

Benzene | 0.8 | 75.2 |

## Boiling Point Formula

The **boiling point formula** is:

**ΔTb = Kb * m * i**

Where:

**ΔTb**is the change in boiling point**Kb**is the molal boiling point elevation constant**m**is the molality of the solution**i**is the van ‘t Hoff factor

## What is Boiling Point?

The **boiling point** of a substance is the temperature at which its vapor pressure equals the surrounding atmospheric pressure.

At this point, the liquid begins to vaporize and form bubbles throughout its volume, not just at the surface.

Let’s consider ethanol boiling point at standard atmospheric pressure (**1 atm**) is approximately **78.37°C (173.07°F)**. This means that when ethanol reaches this temperature, it will begin to boil and transform into a gas.

## How do you calculate boiling point?

Here’s a step-by-step approach:

**Determine the atmospheric pressure**: This is crucial as it directly affects the boiling point.

**Identify the substance**: Each substance has unique properties that influence its boiling point.

**Use the Clausius-Clapeyron equation** for a more precise calculation:

**ln(P2/P1) = (ΔHvap/R) * (1/T1 - 1/T2) **

Where:

**P1**and**P2**are pressures**T1**and**T2**are temperatures**ΔHvap**is the heat of vaporization**R**is the gas constant

To calculate the boiling point of water at **0.9 atm**, we would use this equation with known values for water at **1 atm** and **100°C**, then solve for **T2**.

## What is the formula for boiling point correction?

The formula is:

**Corrected Boiling Point = Observed Boiling Point + 0.00012(760 - P)(273 + t)**

Where:

**P**is the observed atmospheric pressure in mm Hg**t**is the observed boiling point in °C

If **water **boils at **98°C** when the barometric pressure is **740 mm Hg**, we can use this formula to correct the boiling point to standard conditions.

The **boiling point correction formula** is used to adjust observed boiling points to account for variations in atmospheric pressure.

## How to calculate boiling point under vacuum?

The **Antoine equation** is commonly used for this purpose:

**log10(P) = A - (B / (C + T))**

Where:

**P**is the vapor pressure**T**is the temperature**A**,**B**, and**C**are substance-specific constants

To find the boiling point under vacuum, you would:

- Determine the vacuum pressure.
- Use the Antoine equation with known constants for your substance.
- Solve for T to find the boiling point at that pressure.

For example, to find the boiling point of acetone at

0.5 atm, you would use its specific Antoine constants and solve for T.

## Sources / References

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