Calculate the H3O+ concentration to the correct number of significant figures fo

Question

Calculate the H3O+ concentration to the correct number of significant figures for solutions with the following pH values.

Part A

Part complete

pH = 4.7

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Part B

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pH = 10.66

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Part C

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pH = 0.00

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Part D

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pH = 14.30

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Part E

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pH = -0.90

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Part F

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pH = 5.244

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Calculate the H3O+ concentration to the correct number of significant figures for solutions with the following pH values.

Part A

Part complete

pH = 4.7

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Part B

Part complete

pH = 10.66

[H3O+] = M

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Part C

Part complete

pH = 0.00

[H3O+] = M

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Part D

Part complete

pH = 14.30

[H3O+] = M

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Part E

Part complete

pH = -0.90

[H3O+] = M

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Part F

Part complete

pH = 5.244

[H3O+] = M

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[H3O+] = M

Explanation / Answer

sol:-

pH = - log10 [H3O+]

therefore , [H3O+] = 10-pH ...................( 1 )

Part A

Given , pH = 4.7

therefore, substitute value of pH in equation (1) , we have

[H3O+] = 10-4.7

   [H3O+] = 1.99 x 10-5

i.e [H3O+] = 2.0 x 10-5

Part B

given pH = 10.66

therefore , from equation (1) ,we have

  [H3O+] = 10-10.66

[H3O+] = 2.18 x 10-11

i.e [H3O+] = 2.2 x 10-11

Part C

given , pH = 0.00

therefore , from equation (1)

  [H3O+] = 10-0.00

i.e [H3O+] = 1.0

Part D

given pH = 14.30

therefore , from equation (1) , we have

[H3O+] = 10-14.30

[H3O+] = 5.01 x 10-15

i.e [H3O+] = 5.0 x 10-15

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