Calculate [H+] for each of the following solutions, and indicate whether the sol

Question

Calculate [H+] for each of the following solutions, and indicate whether the solution is acidic, basic, or neutral.

A solution in which [OH] is 100 times greater than [H+]. Express your answer using two significant figures.

Calculate [OH] for each of the following solutions, and indicate whether the solution is acidic, basic, or neutral.

[H+]= 8.2×103 M .

Express your answer using two significant figures.

A solution in which [H+] is 15 times greater than [OH].

Express your answer using two significant figures.

Explanation / Answer

1)

we know that

[H+] [OH-] = 10-14

now

given that

[OH-] = 100 [H+]

so

[H+] x 100 [H+] = 10-14

[H+]^2 = 10-16

[H+] = 1 x 10-8

now

we know that

pH = -log [H+]

so

pH = -log 1 x 10-8

pH = 8

now

we know that

if pH < 7 , acidic

if pH = 7 , neutral

if pH > 7 , basic

so

in this case , the solution is basic

2)

now

[H+] [OH-] = 10-14

given

[H+] = 8.2 x 10-3

so

8.2 x 10-3 x [OH-] = 10-14

[OH-] = 1.2195 x 10-12

now

pH = -log [H+]

pH = -log 8.2 x 10-3

pH = 2.086

now

as pH < 7 , the solution is acidic

3)

given

[H+] = 15 [OH-]

now

[H+] [OH-] = 10-14

15 [OH-] x [OH-] = 10-14

[OH-] = 2.582 x 10-8

now

[H+] = 15 x [OH-]

[H+] = 15 x 2.582 x 10-8

[H+]= 3.873 x 10-7

now

pH = -log [H+]

pH = -log 3.873 x 10-7

pH = 6.41

so

as pH < 7 , the solution is acidic

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