# Polar protic solvents with melting point between between 0 °C and 25 °C [closed]

Need a solvent for a freezing point depression experiment. Acetic acid is the only one I know of, but it is not ideal due to the low freezing point depression constant. Any suggestions?

• does it have to be polar protic? Benzene is pretty good for FP depression experiments. Sep 22, 2020 at 13:42
• @AniruddhaDeb I want a solvent like water, what do u think? Sep 22, 2020 at 14:55
• What do you mean by telling acetic acid is not ideal due to the low freezing point depression constant? $K_f$ of acetic acid is larger than water. Sep 22, 2020 at 18:45

Followings solvents have higher freezing point depression constants than that of water:

$$\newcommand{\d}[2]{#1.&\hspace{-1em}#2} \begin{array}{lrr} \hline \text{Solvent} & \text{m.p.}/\pu{°C} & K_\mathrm{f}/\pu{°C m-1} \\ \hline \text{Water} & 0 & -1.86 \\ \text{Nitrobenzene} & 5.67 & -7.00 \\ \text{Cyclohexane} & 6.54 & -20.2 \\ \text{Acetic acid} & 16.6 & -3.90 \\ tert\text{-Butanol} & 25.82 & -20.2\\ \text{Phenol} & 43.0 & -7.27 \\ \hline \end{array}$$

So far, the best value is that of cyclohexene. Even though its melting point (m.p.) is $$\gt \pu{25 ^\circ C},$$ I also included phenol, just for curiosity.

• @Buck Thorn: I voted to close under "Openion-based" when it is up. Then I found OP's comment of acetic acid, which is not correct. So I put the data I found as an answer for benefit of readers including OP. Sep 23, 2020 at 8:29

Between $$5$$°C and $$10$$°C, you may find the following freezing points : 4-chlorotoluene, nitrobenzene, ethylenediamine, cyclohexane, decanol, formic acid.

Between $$10$$° and $$15$$°C, there is : acrylic acid, cyclooctane, dichloracetic acid, dioxane, oleic acid, paraldéhyde, phenylglycol, safrol, p-xylene, m-cresol, ethanolamine.

Between $$15$$°C and $$20$$°C, there is : acetophenone, dimethylsulfoxide, glyoxal, lactic acid, methacrylic acid, undecan-1-ol, butane-1,4-diol.

Between $$20$$° and $$25$$°C, there is : cyclohexanol, dodecan-1-ol, glycerol, hexadecane, heptadecane

• not all of these are protic though. Sep 22, 2020 at 16:45
• @AniruddhaDeb - so pick one that is? Lots of choices there. Sep 22, 2020 at 17:23