Thanks! Once you know what makes two (or more) substances “likes”, the answer is self-evident. Why does this rule exist and how does it work? If the Gibbs free energy change of a process is negative then the process is likely to happen. like dissolves like. Shouldn't it be that different molecules attract to eachother. What are the principles behind it? This view is … It is most often used when discussing polar and nonpolar solvents. The quick answer is that “Like dissolves like”. Specifically, polar solvents tend to dissolve polar solutes, and non-polar solvents tend to dissolve non-polar solutes, while non-polar and polar substances are Immiscible (do not mix). The rule states that polar solutes will dissolve in polar solvents and non-polar solutes will dissolve in non-polar solvents. Like Dissolves Like When it comes to explaining or determining solubility of solvents, we use a helpful phrase that goes like this: Like dissolves Like. The types of intermolecular forces dictate these results. For example it says polar molecules will dissolve polar molecules and non-polar molecules will dissolve non-polar molecules? This means that polar molecules will dissolve polar molecules, and non-polar molecules will dissolve with non-polar molecules. 2 comments. Polar solvents dissolve polar solutes....of course there is a catch... Polar solvents TEND to dissolve polar solutes....and non-polar solvents TEND to dissolve non-polar solutes...but this is a VERY general rule of thumb. Polar compounds dissolve in polar compounds and nonpolar dissolve in nonpolar. Well, this is where chemistry gets a little tricky, becomes a 'case by case' study, and starts having more exceptions to a rule than anything else. A popular aphorism used for predicting solubility is "like dissolves like" also expressed in the Latin language as "Similia similibus solventur". For example, why doesn't a polar molecule dissolve a non-polar molecule. This is a bit like the old slogan “Safety is no accident”. Question 8 See the information in Question 6 of the Makeup Remover pdf file opened in the first step of this assignment. > Why is this so? basically, what is the chemical principle behind the theory of "Like dissolves Like" this is in regards to a Liquid Chromatography experiment with grape koolaid and the aforementioned silica c-18 hydrocarbon. Hexane has a six carbon chain and is nonpolar. And here when we say "polar" we mean "charge-separated". Chemists say that ‘like dissolves like,’ meaning that substances with similar chemical characteristics will dissolve in each other. For something to dissolve it must not only lose the bonds it has between its own particles, but it must also break the bonds the solvent has between solvent particles. share. Polar substances tend to dissolve in polar solvents, and nonpolar substances dissolve in nonpolar solvents. Also, how do non-polar molecules dissolve non-polar molecules? This statement indicates that a solute will dissolve best in a solvent that has a similar chemical structure to itself. Can Someone Explain Why the "Like Dissolves Like" Chemistry Solubility Rule Works Like I Am 5. Why do each of them form homogeneous solutions? Why does like dissolves like? I was wondering why is it that like solvents dissolve like solutes? The usual and simplistic divide is to categorize materials as polar or non-polar. This means that substances are more likely to dissolve in other substances with similar chemical properties. Question 7 Based on the "like dissolves like" principle, please explain why the product you identified as not homogeneous has two different layers. When a solute dissolves in a solvent the individual particles of the solute separate from their neighbours and move between the spaces of the solvent particles. As with most systems, this one will try to minimize its total energy. 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