Question

Calculate the [OH−] of each aqueous solution with the following [H3O+]. Part A coffee, 1.0×10−5 M...

Calculate the [OH−] of each aqueous solution with the following [H3O+].

Part A

coffee, 1.0×10−5 M

Express your answer using two significant figures.
[OH−] =   M  

Part B

soap, 1.0×10−8 M

Express your answer using two significant figures.
[OH−] =   M  

Part C

cleanser, 4.9×10−10 M

Express your answer using two significant figures.
[OH−] =   M  

Part D

lemon juice, 2.5×10−2 M

Express your answer using two significant figures.
[OH−] =   M  
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Homework Answers

Answer #1

Sol :-

Ionic product of water (Kw) = [H3O+].[OH-]

Kw of water at 25 0C = 1.0 x 10-14 M2

again,

[H3O+] = Kw/[OH-]

[OH-] = 1.0 x 10-14 M2 / [H3O+]

Part. (A). [H3O+] = 1.0 x 10-5 M

[OH-] = 1.0 x 10-14 M2 / 1.0 x 10-5 M

[OH-] = 1.0 x 10-9 M

------------------

Part. (B). [H3O+] = 1.0 x 10-8 M

[OH-] = 1.0 x 10-14 M2 / 1.0 x 10-8 M

[OH-] = 1.0 x 10-6 M

------------------

Part. (C). [H3O+] = 4.9 x 10-10 M

[OH-] = 1.0 x 10-14 M2 / 4.9 x 10-10 M

[OH-] = 2.0 x 10-5 M

------------------

Part. (D). [H3O+] = 2.5×10−2 M

[OH-] = 1.0 x 10-14 M2 / 2.5×10−2 M

[OH-] = 4.0 x 10-13 M

------------------

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