Ka correlation to strength of an acid

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Aliya Jain 2B
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Ka correlation to strength of an acid

Postby Aliya Jain 2B » Thu Jan 23, 2020 2:43 pm

what is the relationship between the Ka and how strong an acid is?

Brittney Hun 2C
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Re: Ka correlation to strength of an acid

Postby Brittney Hun 2C » Thu Jan 23, 2020 2:46 pm

If the Ka is large it means it's a stronger acid. The greater the number the more it dissociates so more H+ will be in solution.

Justin Seok 2A
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Re: Ka correlation to strength of an acid

Postby Justin Seok 2A » Thu Jan 23, 2020 3:02 pm

The Ka is basically the measure of how much something dissociates, so if you have a larger Ka then you know more H3O+ will form, giving you a stronger acid. On the other hand, a lower pKa is a sign of a stronger acid.

Andrew Liang 1I
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Re: Ka correlation to strength of an acid

Postby Andrew Liang 1I » Thu Jan 23, 2020 3:35 pm

small pKb = more basic
small pKa = more acidic
large Kb = more basic
large Ka = more acidic

Asia Yamada 2B
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Re: Ka correlation to strength of an acid

Postby Asia Yamada 2B » Wed Jan 20, 2021 12:49 am

The reason why a larger Ka value correlates to a stronger acid is because Ka=[products]/[reactants] and the larger the Ka value is, the more products there are. When there are a lot of products, that means that a lot of the acid (reactant) dissociated which means there will be more H+ ions, making the solution more acidic.

derickngo3d
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Re: Ka correlation to strength of an acid

Postby derickngo3d » Wed Jan 20, 2021 10:33 am

The higher the Ka-value, the stronger the acid.

Jason Knight - 1F
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Re: Ka correlation to strength of an acid

Postby Jason Knight - 1F » Wed Jan 20, 2021 10:42 am

Strong acids have a large Ka value, which in-return leaves a lower pKa value. The same applies to strong bases, as they have a larger Kb and a lower pKb value.

Arya Adibi 1K
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Re: Ka correlation to strength of an acid

Postby Arya Adibi 1K » Wed Jan 20, 2021 10:43 am

If there is a higher Ka value, that means that there is a higher concentration of products (H30+), and will have a lower pKa or pH, so it is a stronger acid.

Kathy_Li_1H
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Re: Ka correlation to strength of an acid

Postby Kathy_Li_1H » Thu Jan 21, 2021 1:10 pm

Hi! The higher the Ka value, the stronger the acid. However, the lower the pKa value, the stronger the acid. Both mean the same but one of them just includes logarithms.

reyvalui_3g
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Re: Ka correlation to strength of an acid

Postby reyvalui_3g » Thu Jan 21, 2021 1:16 pm

A larger value of Ka means that the acid is stronger.

Carly_Lipschitz_3H
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Re: Ka correlation to strength of an acid

Postby Carly_Lipschitz_3H » Thu Jan 21, 2021 5:10 pm

A larger Ka means the acid is stronger. A smaller Ka means the acid is weaker.

Sophia Wendin 3L
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Re: Ka correlation to strength of an acid

Postby Sophia Wendin 3L » Thu Jan 21, 2021 6:06 pm

Asia Yamada 2B wrote:The reason why a larger Ka value correlates to a stronger acid is because Ka=[products]/[reactants] and the larger the Ka value is, the more products there are. When there are a lot of products, that means that a lot of the acid (reactant) dissociated which means there will be more H+ ions, making the solution more acidic.


Thank you! Knowing the reason why helps me remember things better.

Gigi Elizarraras 2C
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Re: Ka correlation to strength of an acid

Postby Gigi Elizarraras 2C » Thu Jan 21, 2021 7:46 pm

The larger the Ka the stronger the acid, and conversely, the larger the pKa the weaker the acid:)

Emerald Wong 1B
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Re: Ka correlation to strength of an acid

Postby Emerald Wong 1B » Thu Jan 21, 2021 8:27 pm

A larger Ka is a stronger acid, since there are more products/ the acid has dissociated a lot more.

Maya Johnson 2a
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Re: Ka correlation to strength of an acid

Postby Maya Johnson 2a » Thu Jan 21, 2021 8:33 pm

A larger Ka is a stronger acid.

Felicia Wei 1B
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Re: Ka correlation to strength of an acid

Postby Felicia Wei 1B » Thu Jan 21, 2021 10:26 pm

Weak acids have small Ka while strong acids will have larger Ka.

Jasmine Yi 1G
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Re: Ka correlation to strength of an acid

Postby Jasmine Yi 1G » Fri Jan 22, 2021 3:13 pm

Stronger acids dissociate completely, so larger Ka probably correlates to stronger acids.

Chelsea_Guzman_3C
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Re: Ka correlation to strength of an acid

Postby Chelsea_Guzman_3C » Fri Jan 22, 2021 3:40 pm

The acid is stronger when Ka is greater.

Morgan Gee 3B
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Re: Ka correlation to strength of an acid

Postby Morgan Gee 3B » Fri Jan 22, 2021 4:42 pm

Ka is calculated with the general equation, Ka = [A-][H3O+]/[HA]. [] represents concentration, A- is the conjugate base of an acid, H3O+ is a hydronium ion, and HA is the acid. As an acid dissociates and gives off an H+ to an H2O, the concentration of A- and H3O+ both increase. We determine how strong an acid is by how much H+ it gives off. Another way of phrasing that would be how acidic a solution becomes after adding the acid. Based on these facts, as Ka increases, H3O+ increases, indicating a stronger acid. High Ka values correlate to strong acids, while low Ka values correlate to weak acids. Something similar can be said for Kb and bases.

Charlotte Adams 1A
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Re: Ka correlation to strength of an acid

Postby Charlotte Adams 1A » Fri Jan 22, 2021 5:13 pm

Stronger acid= higher Ka, lower pKa
weaker acid=lower Ka, higher pKa

Justin Lin 1B
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Re: Ka correlation to strength of an acid

Postby Justin Lin 1B » Fri Jan 22, 2021 5:15 pm

Having a larger Ka value means that it is a stronger acid, relative to weak acids when comparing their strengths.

Eliana Carney 3E
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Re: Ka correlation to strength of an acid

Postby Eliana Carney 3E » Sat Jan 23, 2021 9:03 pm

Hey Aliya!
Basically, the Ka value is a measurement of how much an acid dissociates in solution. Therefore, the higher the Ka value, the more the acid has dissociated, the higher the concentration of hydronium ions in solution, and the stronger the acid. Similarly, the lower the Ka value the weaker the acid because the concentration of hydronium ions in solution is lower. Hope this helps!

t_rasul2I
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Re: Ka correlation to strength of an acid

Postby t_rasul2I » Sun Jan 24, 2021 1:22 pm

stronger acids have a higher acidity dissociation constant (ka) which is because the ratio of products over ratio are higher when the acid is able to disociate more. This is why strong acids don't have a ka. They have an exponentially larger number of products to reactants and so it looks like the [products]/0.

Tatyana Bonnet 2H
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Re: Ka correlation to strength of an acid

Postby Tatyana Bonnet 2H » Sun Jan 24, 2021 1:36 pm

A larger Ka means more acidic because the larger number comes from a greater amount of products than reactants indicating that it is dissociating more completely and the forward reaction is favored. Likewise the smaller the pKa the more acidic it is because you are taking the -log of the Ka.

Presley Gao 2C
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Re: Ka correlation to strength of an acid

Postby Presley Gao 2C » Sun Jan 24, 2021 4:30 pm

The relationship between the Ka and how strong an acid is the larger the Ka the stronger the acid.

Gustavo_Chavez_1K
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Re: Ka correlation to strength of an acid

Postby Gustavo_Chavez_1K » Sun Jan 24, 2021 5:40 pm

The larger the Ka value, the stronger the acid. The larger the Kb value, the stronger the base.

Jared Limqueco 3E
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Re: Ka correlation to strength of an acid

Postby Jared Limqueco 3E » Sun Jan 24, 2021 5:57 pm

A strong acid would have a high dissociation value, Ka

Isabella Cortes 2H
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Re: Ka correlation to strength of an acid

Postby Isabella Cortes 2H » Sun Jan 24, 2021 5:59 pm

a larger Ka value means that an acid is stronger

Kiana Tashakori 1D
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Re: Ka correlation to strength of an acid

Postby Kiana Tashakori 1D » Sun Jan 24, 2021 6:14 pm

The larger the Ka, the stronger the acid. This is because the larger the Ka, the more it dissociates and the more H3O+ will form. A larger Ka will result in a lower pKa though so lower pKa=stronger acid and larger Ka= stronger acid.

Biona Hui 1G
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Re: Ka correlation to strength of an acid

Postby Biona Hui 1G » Sun Jan 24, 2021 6:20 pm

the greater the Ka value, the stronger the acid. If theres more H3O+ that means theres a greater dissociation and its a stronger acid.

DavidTabib 3H
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Re: Ka correlation to strength of an acid

Postby DavidTabib 3H » Sun Jan 24, 2021 9:02 pm

The larger the Ka, the stronger the acid.


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