example 16.119 Calculate the [H3O+] and pH of each of the following H2SO4 soluti

Question

example 16.119

Calculate the [H3O+] and pH of each of the following H2SO4 solutions.

Part A

Calculate the [H3O+] for 0.50 M solution.

Express your answer using two significant figures.

Part B

Calculate pH for 0.50 M solution.

Express your answer using two decimal places

Part C

Calculate the [H3O+] for 0.10 M solution.

Express your answer using two significant figures.

Part D

Calculate pH for 0.10 M solution.

Express your answer using two decimal places

Part E

Calculate the [H3O+] for 0.05 M solution.

Express your answer using two significant figures.

part F

Calculate pH for 0.05 M solution.

Express your answer using two decimal places

Explanation / Answer

1 molecule of H2SO4 gives 2 H3O+ ion

A)

[H3O+] = 2*[H2SO4]

= 2*0.50 M

= 1.00 M

b)

use:

pH = -log [H3O+]

= -log (1)

= 0

Answer: 0.00

c)

[H3O+] = 2*[H2SO4]

= 2*0.10 M

= 0.20 M

d)

use:

pH = -log [H3O+]

= -log (0.2)

= 0.70

e)

[H3O+] = 2*[H2SO4]

= 2*0.05 M

= 0.10 M

f)

use:

pH = -log [H3O+]

= -log (0.1)

= 1.00

Answer: 1.00

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