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okay so in this video were going to use the pH and the KA to find the initial concentration of an acid so coupled with the other two videos this shows you how to use two of three unknowns to solve for the third in all three of those scenarios so once again were going to set up the rates chart for our reaction so HCN aqueous is dissociating into H+ and CN minus cyanide ion and if we look at the rice chart our initial concentration we dont know what it is were trying to solve for that Im just gonna put a Y there for H plus 0 and 0 here for the change therefore minus X plus X plus X and were gonna end up with an equilibrium X x and y minus X all right so given that we have set up this chart I just move this little bit out of the way now were gonna get to figuring out how to solve this the first thing we can do is we can take the pH which we know or given is five point one five and were gonna take the inverse log of this and find that the concentration of h+ is equal to one seven