When an acid dissolves in water, what ion does water form?
Well, we conceive it to be the
Water is conceived to undergo an autoprotolysis reaction as shown.....
When an acid, say
And a base likewise increases concentrations of the characteristic anion,
We can quantify the acid-base equilibrium in water under standard conditions by the equation......
And thus our working equation.....
See here for practical issues with respect to the uses of acids in water.