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Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) ... [2] Acetone: 0.78 56.2 1.67 –94.8 ... Acetonitrile: 0.78 81.6 −45 [8] Heptane:
Critical point: 545 K (272 °C), 4.87 MPa Std enthalpy change of fusion, ... log 10 of Acetonitrile vapor pressure. Uses formula ...
This page contains tables of azeotrope data for various binary and ternary mixtures of solvents. The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point (b.p.) of a component, the boiling point of a mixture, and the specific gravity of the mixture.
The more salt added, the greater the effect on the freezing point. So, if it is 28 degrees Fahrenheit outside, adding extra salt might not be needed as much as if, say, it was 20 degrees out.
Acetonitrile has only modest toxicity in small doses. [11] [19] It can be metabolised to produce hydrogen cyanide, which is the source of the observed toxic effects. [9] [20] [21] Generally the onset of toxic effects is delayed, due to the time required for the body to metabolize acetonitrile to cyanide (generally about 2–12 hours). [11]
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However, adding a salt such as sodium chloride will lower the temperature through the property of freezing-point depression. Although the exact temperature can be hard to control, the weight ratio of salt to ice influences the temperature: −10 °C can be achieved with a 1:2.5 mass ratio of calcium chloride hemihydrate to ice.
According to Bapton, sugar and salt technically never expire. But some of the ingredients added to salt, like iodine, can start to break down, so try to use it within 5 years.