Identify the weakest acid in each of the following sets.
Explain...

Question

Identify the weakest acid in each of the following sets. 
Explain your reasoning. 
(b) NH3, H2O, H2S

Accepted Answer

welcome back everyone. We need to identify the weakest acid from the given and ST Y. So we have hydrogen cell inside our scene and hydrogen telluride acids. And we want to focus on where specifically are Adam's selenium arsenic and Hillary um are located on in our periodic tables. So recall that we have our p block of our periodic table. Where specifically in Group five A. And group six A. And across periods four and five. Beginning with R. Adams selenium, we would find that in Group six A period four we would find arsenic in Group five A period four. And we would find to Laurie um in Group six A period five. And so we want to recall the following fact where with increasing polarity of the acidic hydrogen and the atom bonded to it that would correspond to an increase in acid strength. So an increase in H seven x. So we would recognize on our periodic tables that we have the trend for increasing electro negativity, which increases as you go towards flooring or the top right of our periodic table. And then recall that we have our trend for increasing atomic radius which increases towards the bottom left of the periodic table. And with these trends observed, we would find that selenium is the smallest Atom based on its position being in group six A. and period four and selenium is the most electro negative between arsenic and Tillery. Um And because it's the smallest atom and the most electro negative, that means that therefore the molecule hydrogen cell inside is the most aesthetic. So we can clearly rule out choice B Now we want to focus on the fact that arsenic is the smallest atom, but the least electro negative. And so as far as increasing acid strength, we would say that therefore are seen A. A. S. H. Three is the least acidic acid or the weakest acid. Then we would have hydrogen telluride and then we would have hydrogen cell inside as the strongest acid as we stated above. And so to answer our question, the weakest acid is going to be choice A are seen as the weakest acid because our scene has the smallest size and the hydrogen are seen or arsenic bond is the least polar H. X bond. And this would make sense since we would understand that Arson would be the least willing to donate protons since selenium is or sorry, since arsenic is the least electro negative. And the bond arsenic shares with hydrogen is not as polar. And so hydrogen has a stronger grip on the electrons that it shares with arsenic than it would be if the bond were more polar and then thus more willing to form a proton. So all in all we've explained why our scene is the weakest acid and A is our final answer. If you have any questions leave them down below. Otherwise, I'll see everyone in the next video

Identify the weakest acid in each of the following sets. Explain your reasoning. (b) NH3, H2O, H2S

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