Help pleasee 2012 aso paper q! - chem (1 Viewer)

hihihi · Jul 9, 2016

What is the pH of a 0.010 mol L–1 solution of a weak monoprotic acid that is 4.0% ionised?

tyvm

hihihi · Jul 9, 2016

Fizzy_Cyst · Jul 9, 2016

hihihi said:
What is the pH of a 0.010 mol L–1 solution of a weak monoprotic acid that is 4.0% ionised?

tyvm

If 4% ionisation and monoprotic, then [H+] = 0.04 X 0.01 = 0.0004

Then pH =-log[H+] = -log[0.0004] = 3.4

leehuan · Jul 9, 2016

Basically the formula is

$\text{Degree of ionisation}=\frac{\left[H_3O^+\right]}{[\text{Acid}]}$

Which as Fizzy_Cyst used it, rearranges into
$\left[H_3O^+\right] = [\text{Acid}] \times \text{Degree of ionisation}$

hihihi · Jul 15, 2016

leehuan said:
Basically the formula is

$\text{Degree of ionisation}=\frac{\left[H_3O^+\right]}{[\text{Acid}]}$

Which as Fizzy_Cyst used it, rearranges into
$\left[H_3O^+\right] = [\text{Acid}] \times \text{Degree of ionisation}$

is it alwasys H30+?

Help pleasee 2012 aso paper q! - chem (1 Viewer)

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