Complete the following table: H3O+ OH pH Acidic, Basic, or Neutral? 9.7 Neutral

Question

Complete the following table:

H3O+ OH pH Acidic, Basic, or Neutral?

9.7

Neutral

7×105M 1 × 102M

11.6

Part A

If the pH of the solution is 9.7, what is the [H3O+]?

Express your answer to one significant figure.

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Part B

If the pH of the solution is 9.7, what is the [OH]?

Express your answer to one significant figure.

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Part C

If the solution is neutral, what is the [H3O+]?

Express your answer to one significant figure.

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Part D

If the solution is neutral, what is the [OH]?

Express your answer to one significant figure.

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Part E

If the solution is neutral what is the value of pH?

Express your answer using one decimal place.

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Part F

If the [OH] in a solution is 7×105M, what is the [H3O+]?

Express your answer to one significant figure.

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Part G

If the [OH] in a solution is 7×105M, what is the pH of the solution?

Express your answer using one decimal place.

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Part H

If the [H3O+] in a solution is 1×102M, what is the [OH]?

Express your answer to one significant figure.

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Part I

If the [H3O+] in a solution is 1×102M, what is the pH?

Express your answer using one decimal place.

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Part J

If the pH of the solution is 11.6, what is the [H3O+]?

Express your answer to one significant figure.

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Part K

If the pH of the solution is 11.6, what is the [OH]?

Express your answer to one significant figure.

[H3O+] =   M  

Explanation / Answer

Part A)

Given pH = 9.7

We know that

pH = -log[H+] = -log[H3O+]

then

[H3O+] = 10-pH

= 10-9.7 = 2 x 10-10 M

Part B)

pH = 9.7

We know that

pH + pOH = 14

then pOH = 14 - 9.7 = 4.3

And

[OH-] = 10-pOH = 10-4.3 = 5 x 10-5 M

Part C)

Solution is neutral when pH = 7

therefore

then

[H3O+] = 10-pH

= 10-7 = 1 x 10-7 M

Part D)

If the Solution is neutral then pH=pOH= 7

therefore

[OH-] = 10-pOH

= 10-7 = 1 x 10-7 M

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