Value of Kw?

The Conjugate Seesaw

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Emily Vainberg 1D
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Value of Kw?

Postby Emily Vainberg 1D » Mon Dec 02, 2019 4:04 pm

Is the value for Kw always 1x10^14? In the textbook that is the value they used for the example but I'm not sure if that is always the value.

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Re: Value of Kw?

Postby SarahSteffen_LEC4 » Mon Dec 02, 2019 4:05 pm

Yes, this is the value that is always used because it is a constant.

Sebastian Lee 1L
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Re: Value of Kw?

Postby Sebastian Lee 1L » Tue Dec 03, 2019 10:24 am

For the calculations we will be doing in 14A, this is the value for Kw. All this means is that in water at standard temperature and pressure, the concentration of hydronium ions [H3O+] times the concentration of hydroxide ions [OH-] is 1 x 10-14. This tells us that pH + pOH is 14. However, the value of Kw can change if the temperature changes: at high temps, it increases so water is more acidic; at low temps, it decreases so water is more basic.

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Re: Value of Kw?

Postby 605208780 » Tue Dec 03, 2019 12:58 pm

Yes. This is the constant value that should always be used.

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Re: Value of Kw?

Postby Leila_4G » Tue Dec 03, 2019 9:06 pm

I don't remember learning this, will it be on the final?

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