Calculate the equilibrium concentration of hydrogen ions

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To calculate the equilibrium concentration of hydrogen ions, apply the ICE table method to the dissociation reaction of the weak acid HA. Identify the species involved: HA, H+, and A-. The stoichiometry indicates that for each mole of H+ produced, one mole of HA is consumed. Express the concentrations of HA, H+, and A- in terms of H+ as the unknown variable. This approach simplifies finding the pH, which is the ultimate goal of the calculation.
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Thank you for the link Borek but I'm still lost
 
You have to directly apply the ICE table method to your case.

What is your HA? A-?

Basically it is about stoichiometry - from the dissociation reaction you can easily see that for each mole/molecule of A- (H+) produced, one mole/molecule of HA is consumed. You just have to express concentrations of all three substances involved (HA, H+, A-) in terms of one unknown - best approach is to use H+ as the unknown, as you are asked about pH.
 

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