Electrolytes represent compounds that conduct electricity when entering their ionic forms when dissolved or melted. Recall that conductivity is a physical property that deals with the ability of an electrical current to flow through a material. If we're going to talk about different types of electrolytes, let's start with the strong ones. They represent solutes that completely dissociate into ions when placed in a solvent, typically water. A great example of a strong electrolyte is sodium chloride in solid form. When placed in water, it breaks up completely into its 2 ions, which are sodium ion aqueous, plus chloride ion aqueous. Remember, the aqueous just means that water is surrounding that particular ion. And remember also that we're going to make 100% of both of these ions. Strong electrolytes can represent aqueous soluble ionic compounds, which we learned through the solubility rules, strong acids, as well as strong bases. Now let's look at classifications of this type of electrolyte. The type of electrolyte, of course, is strong. Its degree of dissociation, we're going to say that it completely dissociates, so it breaks up 100%. Because of this, what are the species in solution? Well, the solid form no longer exists. It's been entirely converted into ions. And then conductivity, yes. Because it breaks up into ions, those ions can conduct electricity. Great examples of soluble ionic compounds would be sodium chloride, sodium nitrate, potassium bromide, magnesium chloride. These are based on our understanding of the solubility rules. So, if you haven't watched my videos in terms of them, I highly suggest you go back and take a look. Next are strong acids. And there are a lot of different strong acids. These are the most important ones that you keep in mind. We have hydro, hydrobromic acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid. Strong bases, strong bases we have sodium hydroxide, potassium hydroxide, lithium hydroxides. These are some basic examples of strong bases. We'll go into greater detail in terms of other strong bases for now, but these are three great examples. So just remember, strong electrolytes break up completely into ions and therefore those ions are good conductors of electricity.
Electrolytes (Simplified) - Online Tutor, Practice Problems & Exam Prep
Electrolytes are compounds that can conduct electricity once they are dissolved in a solvent.
Understanding Electrolytes
Whenever you add a solute to a solvent there are three possible outcomes:the solute dissolves completely, dissolves partially or doesn't dissolve at all into ions.
Electrolytes (Simplified) Concept 1
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Strong Electrolytes break up into ions completely and are grouped into 3 categories:Soluble Ionic Compounds, Strong Acids and Strong Bases.
Electrolytes (Simplified) Example 1
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Write a balanced equation for the dissociation of the following strong electrolyte in water. So here we have iron(III) nitrate. So here we're going to have iron(III) nitrate as a solid. It's going to break up in water. Since it's a strong electrolyte, we have a solid arrow going forward. It breaks up into our iron(III) ion, aqueous, plus 3 nitrate ions, aqueous. This here would represent the balanced equation for this particular strong electrolyte.
Fe 3 (NO 3 ) 3 (s) → Fe 3 + (aq) + 3 NO 3 − (aq)Electrolytes (Simplified) Concept 2
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Now, weak electrolytes represent solutes that partially dissolve. They partially dissolve into ions when placed in a solvent. Here we have HF. HF is hydrofluoric acid, which is a weak acid. Acids are typically found in their aqueous form in solution. Here, it's going to break up into the H+ ion aqueous plus F- ion aqueous. Realize here that we see a double arrow here, this reversible arrow. This indicates that we have a weak electrolyte. So, if you're ever looking at a balanced equation and you see a double arrow or reversible arrow like this, that means that this is a weak electrolyte.
Now, weak electrolytes can be either insoluble ionic compounds. Yes. Even insoluble ionic compounds break up a little bit. Weak acids or weak bases. So here, let's take a look at the classifications of electrolytes. We already went over the strong electrolytes earlier. If you haven't looked at that video, make sure you go back and take a look. Now let's look at your weak electrolyte. Your weak electrolytes don't dissociate completely, they dissociate partially. Because they only partially dissociate, it's mostly molecules and only some ions. So if we look up above, we would say that for this weak electrolyte of hydrofluoric acid, a vast majority of it would stay in this form of a HF aqueous, and very little of these ions would actually be formed. So a vast majority of it is still on the reactant side of the equation.
Now, conductivity, we're going to say is weak. Weak because we don't make very many of those ions on the product side. Here we have, in green, our insoluble ionic compounds like calcium sulfate, barium sulfate, and calcium sulfide. These are just some examples of insoluble ionic compounds based on our understanding of the solubility rules. Great examples of weak acids are hydrofluoric acid, which we saw up above, and acetic acid. And then some great examples of weak bases are magnesium hydroxide and ammonia. Now, these are not the only weak acids or weak bases. These are just some great examples of weak acids and weak bases which we can classify as weak electrolytes. So just keep in mind the differences between strong electrolytes and weak electrolytes.
Weak Electrolytes partially break up into ions and are grouped into 3 categories:Insoluble Ionic Compounds, Weak Acids and Weak Bases.
Electrolytes (Simplified) Example 2
Electrolytes (Simplified) Concept 3
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So nonelectrolytes consist of molecular or covalent compounds that don't dissociate into ions. Here we have a good example of glucose solid. Even after placing it in water, it doesn't break up. It's still altogether as glucose, But it's still being surrounded by water, so you can still say it's aqueous. Now examples of other non-electrolytes include water, sugars like glucose, and alcohols, and other non-ionic compounds. Now when I say sugars, sugars are just compounds with the molecular formula of CnH2nOn. Okay? So here glucose we saw C6H12O6. Sucrose deviates a little bit from this. Sucrose is C12H22O11. Glucose and sucrose are the most famous of the sugars that you'll most likely see when dealing with non-electrolytes.
Alcohols are just covalent compounds with carbon and hydrogen connected to OH. Methanol is CH3OH. Phenol is C6H5OH. A key thing to recognize in alcohol is that they end with the word "ol". Methanol, phenol. Now, we've talked about strong electrolytes. We've talked about weak electrolytes. But what about non-electrolytes? Now, their degree of dissociation is: they don't dissociate, so we're going to say no dissociation. They don't break up into ions at all, so it's only molecules. And because they don't break up into ions at all, they don't conduct electricity. Sucrose is a great example besides glucose as being nonelectrolyte. Here we have an alcohol in the case of methanol. We also have these other structures here. We have water, hydrogen peroxide. We also have CH4N2O, which is just an example of a molecular or covalent compound. So just remember, non-electrolytes don't break up into ions whatsoever, and therefore, they cannot conduct electricity like strong and weak electrolytes can.
Non-Electrolytes do NOT break up into ions at all and are commonly referred to as molecular compounds.
Electrolytes (Simplified) Example 3
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The dissolution of a compound is given by the reaction below. Here we have a white sphere and a black sphere, and they break up into separate spheres, which represent their ions. Now identify each of the following solutions as either electrolytic, weakly electrolytic, or non-electrolytic. So if we take a look, something that's electrolytic is strong, that means it would break up 100% into these ions. If we take a look here, the only one that shows us separate white spheres and black spheres where everything is completely broken apart is the last one. So this would be electrolytic. For the next one, we have weakly electrolytic and non-electrolytic. Weakly electrolytic would have more of these intact, but would also have some of these floating around as well. If we take a look, that would be the middle one. So this one is weakly electrolytic. And non-electrolytic, none of these ions would form and they would all exist in this molecular form here, and that would be the first one. So the first one will be non-electrolytic.
Each of the following reactions depicts a solute dissolving in water. Classify each solute as a strong electrolyte, a weak electrolyte or a non-electrolyte.
Problem Transcript
Which of the following represents a non-electrolyte?
a) (CH3)2NH2 b) NaOH c) HIO3 d) C2H5OH e) CsNH2
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