Comparing pH of strong acids/ strong bases

[degenha7]

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Re: strong bases, are group 2 hydroxides more basic (higher pH) than group 1 hydroxides because they contain multiple hydroxides?

Re: strong acids, is H2SO4 more acidic because it is diprotic?

Thanks.

 

[Moka11]

Re: strong bases, are group 2 hydroxides more basic (higher pH) than group 1 hydroxides because they contain multiple hydroxides?

Re: strong acids, is H2SO4 more acidic because it is diprotic?

Thanks.

Re bases no. Only group 1 disassociates 100% (remember that, it's a great trick q)
Re acids, not always. HCl is stronger than H2S.

 

[babowc]

I thought group 1 and 2 strong bases dissociate completely?

 

[DrRoyal Pains]

They do. All the STRONG bases dissociate completely. Ex: Ba(OH)2. Both OH's dissociate completely. Also, I thought H2SO4 WAS more acidic because it is diprotic? The first H dissociates completely, while the second dissociates to a small extent. Mklein, where did you hear of this? Also, HCl is stronger than H2S because HCl is on the list of strong acids, H2S is not.

 

[Moka11]

I thought group 1 and 2 strong bases dissociate completely?

O whoops. Your right. I was confusing that with another non group 2 for example FeOH or somehow to that extent.

 

[Moka11]

They do. All the STRONG bases dissociate completely. Ex: Ba(OH)2. Both OH's dissociate completely. Also, I thought H2SO4 WAS more acidic because it is diprotic? The first H dissociates completely, while the second dissociates to a small extent. Mklein, where did you hear of this? Also, HCl is stronger than H2S because HCl is on the list of strong acids, H2S is not.

In the case of strong acids he's right. Man I'm spacing out today. I thought OPs questions was generally speaking and I was answering "not necessarily". But in strong acids just like storm bases if there is 2 OH'S and 2 H's then it'll obviously be stronger than just 1. Being that it ionizes 100%. Sorry for not reading correctly.

 

[babowc]

But HCl and H2SO4 are comparable in acidity strength.

I don't think you can make a distinguishable acid strength in the strong acids, but just know that they will disassociate completely to form H+, and that H2SO4 has the second acidic proton.

 

[Moka11]

But HCl and H2SO4 are comparable in acidity strength.

I don't think you can make a distinguishable acid strength in the strong acids, but just know that they will disassociate completely to form H+, and that H2SO4 has the second acidic proton.

I think you could. Strong acids dissassociate 100%. So if you had 1 mole of both HCl and H2SO4 you'd get 1 mole of H from the HCl versus 2 from the H2SO4. No?

 

[FreezingLettuce]

I think you could. Strong acids dissassociate 100%. So if you had 1 mole of both HCl and H2SO4 you'd get 1 mole of H from the HCl versus 2 from the H2SO4. No?

Well, only the first H of a diprotic strong acid (H2SO4) dissociates completely. To find how much the H of HSO4- dissociates you would need a Ka.

So H2SO4 is slightly more acidic, but not to a great degree.

 

[roquer2]

Well, only the first H of a diprotic strong acid (H2SO4) dissociates completely. To find how much the H of HSO4- dissociates you would need a Ka.

So H2SO4 is slightly more acidic, but not to a great degree.

👍 There's the key word. SLIGHTLY

 

[babowc]

👍 There's the key word. SLIGHTLY

👍👍
I can always count on you for right answers!! haha