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Ka

Posted: Fri Jan 25, 2019 12:19 am
by Melissa Villanueva1K
For 12.79 I look for the Ka value for H2SO4 but on table 12.10 all it says is 'strong' for Ka1, what does that mean? Could someone please explain, thanks!

Re: Ka

Posted: Fri Jan 25, 2019 12:30 am
by Shubham Rai 2C
Since it is a strong acid it doesn't have a Ka value as it dissociates completely in the reaction.

Re: Ka

Posted: Fri Jan 25, 2019 1:45 pm
by monikac4k
H2SO4 is a polyprotic acid. When it loses the first hydrogen, the reaction is strong since it completely dissociates into HSO4- and H+. The second dissociation isn't so complete; HSO4- is a weak acid and has a Ka value.

Re: Ka

Posted: Sat Jan 26, 2019 12:11 pm
by Parth Mungra
If you wanted to find the total amount of hydronium ions, you add the hydronium produced from the H2So4 and the ones produced by HS04-. H2S04 dissociates completely but HS04- is a weak base.

Re: Ka

Posted: Sat Jan 26, 2019 2:30 pm
by Danny Zhang 4L
Because H2SO4 is a strong acid, it will not have a Ka value because it completely dissociates into H and HSO4 when it first loses the hydrogen.

Re: Ka

Posted: Sat Jan 26, 2019 4:25 pm
by Anita Wong 1H
strong acids dont have ka values. if you see a ka value, its most likely a weak acid

Re: Ka

Posted: Sat Jan 26, 2019 6:08 pm
by Nandhini_2K
The higher the Ka value the weaker the acid. Since H2SO4 doesn't have a ka value at all it is a strong acid.