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matrenka [14]
3 years ago
13

What do El Niño and La Niña have in common? Check all that apply.

Chemistry
2 answers:
Yakvenalex [24]3 years ago
7 0
Can you post a picture of that the checkings are
oksian1 [2.3K]3 years ago
4 0

C).Both occur in the Pacific Ocean.


E).Both are causes of short-term climate change.

Just took the Cumulative Exam, so I'm correct the one's I got wrong.


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Answer:

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Explanation:

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[NaA] and [A-] = 0.05/0.6 = 0.083 M

Kb = Kw/Ka = 10^-14/[H+] = 10^-14/10^-5 = 10^-9

b) For the stoichiometric point in the titration, 0.100 moles of NaA have to be found in a 1.1L solution, and this is equal to:

[A-] = [H+] = (0.1 L)*(1 M)/1.1 L = 0.091 M

pKb = 10^-9

Ka = 10^-5

HA = H+ + A-

Ka = 10^-5 = ([H+]*[A-])/[HA] = [H+]^2/(0.091 - [H+])

[H+]^2 + 10^5 * [H+] - 10^-5 * 0.091 = 0

Clearing [H+]:

[H+] = 0.00095 M

pH = -log([H+]) = -log(0.00095) = 3.02

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