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A4 Which ONE of the following solids when added to 1 L of water will change the pH from 2.80 to 6.25? (N.B. there is no chang
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Answer #1

use:

pH = -log [H+]

2.8 = -log [H+]

[H+] = 1.585*10^-3 M

use:

pH = -log [H+]

6.25 = -log [H+]

[H+] = 5.623*10^-7 M

Decrease in concentration of [H+] = 1.585*10^-3 M - 5.623*10^-7 M

= 1.58*10^-3 M

Since solution volume is 1 L,

Mol of H+ decreased = 1.58*10^-3 mol

So,

Mol of OH- added = 1.58*10^-3 mol

Answer: B

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