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hi Im professor Clements and today the problem were gonna be working on is titration of a weak acid with a strong base and for this problem Ive chose formic acid just randomly essentially and were gonna titrate 25 milliliters of 0.2 molar formic acid with 0.4 molar sodium hydroxide and it turns out there are several points to a titration that were going to be worried about so this video is going to come in several parts one of the things we might be concerned about is whats the initial pH when we put the formic acid on our bench top what is going to be the initial pH of that and it turns out that problem is relatively simple if you remember how to do a weak acid because formic acid is simply a weak acid and so even though its a titration problem this part of its fairly simple and were just gonna look at how do we solve for the pH of a weak acid so we take our formic acid we go ahead and we look up in a table that the KA for formic acid is 1.8 times 10 to the minus fourth and y