Calculate the pH to the correct number of significant figures for solutions with

Question

Calculate the pH to the correct number of significant figures for solutions with the following concentrations of H3O+ or OH? .

Part A

Part complete

[H3O+] = 2.5×10?5 M

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Part B

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[OH?] = 10?3 M

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Part C

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[H3O+] = 3.50×10?9 M

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Part D

Part complete

[H3O+] = 9×10?3 M

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Part E

Part complete

[OH?] = 15 M

Calculate the pH to the correct number of significant figures for solutions with the following concentrations of H3O+ or OH? .

Part A

Part complete

[H3O+] = 2.5×10?5 M

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Part B

Part complete

[OH?] = 10?3 M

pH =

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Part C

Part complete

[H3O+] = 3.50×10?9 M

pH =

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Part D

Part complete

[H3O+] = 9×10?3 M

pH =

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Part E

Part complete

[OH?] = 15 M

pH = pH =

Explanation / Answer

Answer - Part A

[H3O+] = 2.5×10?5 M

pH = -log[H3O+]

pH = -log[2.5*10-5]

pH = 4.6

Part - B

[OH?] = 10?3 M

pOH = -log[10-3]

pOH = 3

pH = 14-3 = 11

pH+pOH = 14

Part C. [H3O+] = 3.5*10-9 M

pH = -log[H3O+]

pH = -log[ 3.5*10-9]

pH = 8.4559

Part D -

[H3O+] = 9*10-3 M

pH = -log[H3O+]

pH = -log[ 9*10-3]

pH = 2.0457

Part E - [OH-] = 15M

Here it seems mistake beacause pOH beaceme (-1.176), which is not possible.

let us assume,

[OH-] = 0.15M

pOH = -log[0.15]

pOH = 0.823

pH = 14-0.823 = 13.176

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