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You have a water solution of 1L at pH 6.5 in a beaker. You are interested in adjusting the pH of the solution to pH

You have a water solution of 1L at pH 6.5 in a beaker. You are interested in adjusting the pH of the solution to pH 5.5 with 0.5M HCl. What is the volume of 0.5M HCl do you need? After adjusting the pH, you added 1 mole of a solid weak acid (pKa 5.5) and measured the pH of the solution is 5.8. What is the concentration of the uncharged weak acid in the beaker?

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