Question

Calculate poh of 10^-2 m monobasic acid if value of kw at 90c is 10^-12

Answer 1

For Mono-basic acid, the Hydrogen Ion concentration will be equal to its concentration.

∴ H⁺ concentration = 10⁻² M.

Using the Formula,

pH = -log[H⁺]

pH = - log[10⁻²]

pH = 2log10

pH = 2

Now, The Ionic Product of the water = 10⁻¹²

∴ Sum of the Hydronium ions concentration and Hydroxy ions concentration =  12

∴ pOH + pH = 12

⇒ pOH = 12 - 2

⇒ pOH = 10  

Hope it helps.

Answer 2

The pOH of the mono basic acid is 10.

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