In: Chemistry
What is the pH of a 0.260 M solution of H2SO4? Ka2 = 1.20×10^–2?
Sulphuric acid ionises into two steps.
For the first step,
This is because sulphuric acid is completely dissociated in the first step.
An ICE table is made for econd step
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Initial concentration (M) | 0.260 | 0 | 0.260 |
Change in concentration (M) | -x | +x | +x |
Equilibrium concentration (M) | 0.260-x | x | 0.260+x |
The equilibrium constant
Since Ka2 is small, we assume that x is small with respect to 0.260.
from second step.
Total