Problem 15.18 Part A Constants| Periodic Table The following pictures represent

Question

Problem 15.18 Part A Constants| Periodic Table The following pictures represent aqueous solutions of three acids HA (A-X, Y, or Z); water molecules have bee Arrange the three acids in order of decreasing value of Ka Rank acids from strongest to weakest. To rank items as equivalent, overlap them n omitted for clarity.(Figure 1) Reset Help HX HY HZ strongest acid weakest acid The correct ranking cannot be determined. Figure 1 of 1> Submit uest Ans Part B Which acid, if any, is a strong acid? Check all that apply HX HY HZ HX HY HZ Submit uest Ans

Explanation / Answer

Ans

Part A :

The higher the dissociation of acid into its protons , higher will be its Ka , and higher will be the acidic strength.

So here , the ranking from strongest to weakest will be :

HZ > HX > HY

Part B :

HZ

Since HZ acid has been completely dissociated into water into its constituent ions , it is the strong acid.

Part C :

HY

HY has least number of A- ions , so also H+ ions will be least , which will cause a little decrease in pH than the neutral . Whereas the others have higher dissociations in water so more protons and lesser pH.

Part D :

HZ

HZ is a strong acid that is completely dissociated in water and liberates its H+ ions. So it has the lowest pH amongst all.

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