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Melissa Villanueva1K
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Postby Melissa Villanueva1K » Fri Jan 25, 2019 12:19 am

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!

Shubham Rai 2C
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Re: Ka

Postby Shubham Rai 2C » Fri Jan 25, 2019 12:30 am

Since it is a strong acid it doesn't have a Ka value as it dissociates completely in the reaction.

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Re: Ka

Postby monikac4k » Fri Jan 25, 2019 1:45 pm

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.

Parth Mungra
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Re: Ka

Postby Parth Mungra » Sat Jan 26, 2019 12:11 pm

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.

Danny Zhang 4L
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Re: Ka

Postby Danny Zhang 4L » Sat Jan 26, 2019 2:30 pm

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.

Anita Wong 1H
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Re: Ka

Postby Anita Wong 1H » Sat Jan 26, 2019 4:25 pm

strong acids dont have ka values. if you see a ka value, its most likely a weak acid

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Re: Ka

Postby Nandhini_2K » Sat Jan 26, 2019 6:08 pm

The higher the Ka value the weaker the acid. Since H2SO4 doesn't have a ka value at all it is a strong acid.

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