Acids donate _______________________ to an aqueous solution, w...

Question

Acids donate ___________ to an aqueous solution, which will lead to a(n) _ in pH. In contrast, bases donate _ to an aqueous solution and will _ the pH. The pH of a solution with more OH⁻
than H⁺ will have a(n) _____________ pH.

than H⁺ will have a(n) _______________________ pH.

Accepted Answer

Hi, everybody. And welcome back. Our next question says which of the following statements about the interaction of an acid with an aqueous solution is true. A acids donate hydroxide ions to an aqueous solution. B acids donate hydrogen ions to an aqueous solution. C acids can raise the ph of an aqueous solution. Or D acids can dilute an a wave solution. Well, first of all, we need to make sure we recall what an aqueous solution is and that would be a solution where water is the solvent. So we're adding an acid to a solution that's water based what's going to happen. Well, we can eliminate choice of D right away. Acids can dilute an aqueous solution because by dilute, we would mean to add water to the solution to decrease solute concentration. So I have solute and brackets there to symbolize solute concentration. Whereas when I'm adding an acid to an aqueous solution, I am increasing solute concentration. I'm adding a solute to my aqueous solution. So this will be the opposite of a diluting a solution. So that one we can rule out waterway just logically. Now let's look at our other answer choices. So we have the choice of acids donating hydroxide ions or donating hydrogen ions. What are hydroxy ions? Let's recall their oh minus ions. Well, hydrogen ions would be H plus. When you hear the phrase hydrogen ion, it always means H plus um hydrogen under certain circumstances can become accept an electron and become H minus, but that's called a hydride ion. So when we say hydrogen ion, we mean H plus. Well, the very definition of an acid is a proton donor. Notice that H plus hydrogen without an electron is a proton. So high acids are proton donors or H plus donors. The choice B is going to be our correct answer. Now note that in an aqueous solution, we won't have these hydrogen ions just floating around as hydrogen ions in the solution, water can act as an acid or a base. So water molecules will accept that proton to become hydro. So the actual effect in aqueous solution is that our hydro hydro ion concentration will increase the hydro hydro ion. Excuse me, that's a little tongue twister is H 30 plus. So h2o with an extra H plus so that hydro ion concentration will increase. So just a little side note to be aware of when you're thinking about what's actually going on in an aqueous solution. So then we look at choice a acids donate hydroxide ions. Well, it would be bases that donate hydroxide ions to an aqueous solution. So do I say incorrect. And then we look down at choice C acids can raise the ph of an aqueous solution. Well, the more acidic the solution, the lower the Ph. So acids will lower the ph of an aqueous solution. So choice C is incorrect. So we have our answer. Choice B if you want just a little further explanation, sometimes ph can be a little bit tricky to think through because it involves a negative logarithm. But if you want to just touch base and remember why acids lower the PH, stay tuned for a few seconds. So we can recall that the value of Ph equals the negative logarithm of the H plus concentration. So think about comparing two solutions where we have a Ph equal to two and a Ph equal to eight. So we know by our general rule that this solution with a Ph of two is more acidic. So if Ph is the negative log of the H plus concentration, that means when the Ph is two, that H plus concentration will equal 10 to the minus two molar. When the ph is equal to eight, that H plus concentration will equal to 10 or will equal 10 to the minus eight molar. So you can see that that 10 to the minus two will be a higher hydrogen ion concentration. So it's sometimes a little tricky to think through because of that, it's a logarithm. It's a negative logarithm. But the end result is when you look at actual concentrations, the lower the ph, the higher the H plus concentration. So that's why the more acidic the solution, the lower the ph. So returning back to our main question once again, the why, which of the following statements about the interaction of an acid with an aqueous solution is true. Our answer was choice B acids donate hydrogen ions to an aqueous solution. See you in the next video.

Acids donate ___________ to an aqueous solution, which will lead to a(n) _ in pH. In contrast, bases donate _ to an aqueous solution and will _ the pH. The pH of a solution with more OH⁻
than H⁺ will have a(n) _____________ pH.

Key Concepts

Acids and Proton Donation

Bases and Hydroxide Ion Donation

pH Scale and Ion Concentration

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