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hi everyone in this video Id like to show you how to calculate the pH for a weak acid solution so before we get started on an example theres just a few things you want to make sure were totally clear on so the first thing is is that the concentration of the weak acid that we initially put into the solution is going to be much much greater than the concentration of the H+ produced so you cannot use the concentration given for the acid as the value of H+ in your calculation so what youre going to need to do is determine the equilibrium concentration for your H+ then the last thing you need to know is that when youre calculating pH that equation is the pH is equal to the negative log of h plus okay so lets take a look at this calculation so if we really the question it says calculate the pH for a 1 molar solution of hydrofluoric acid and then were also given a KA value so first we want to pull out the relevant pieces of information so if we take a look over here were told that we