Acids donate H+ ions and base accept H+ ions. The pH of an acid can be wroked out by using -log(concentration of the acid) this is how to work out the pH of a weak acid.
To work out the concentration of a base you first have to work out the pH and take the pH away from the value of 14 which is the highest pH to give the pH of the base .
Ka is value that is worked out for weak acids ( named weak as they do not fully dissociate, whereas strong acids fully dissociate)
Ka is eqaul to the concentration of H+ times by the concentration of the salt divided by the concentration of the acid.
You assume that none of the H+ come from water , the concentration of the aicd is the same at equlibrium as in the orginal solution and that , you assume that the concentration of salt and H+ ion are the same.
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