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Calculate the volume of 1M solution of HCl needed for 1 unit shift of the pH of the following solutions:
a) 100mL of 0.01M solution of weak acid (pKa=6) and 0.05M of it's sodium salt
b) 0.005M of sodium formate and 23g of formic acid dissolved in 100mL of water (pKa of formic acid=3.75)
c) 100mL of 0.1M ammonia solution
a 0.02M solution of lactic acid (pK=3.86) is mixed with an equal volume of a 0.05M solution of sodium lactate. what is the pH of the final solution? (from answer key) pH = 3.86 + log (0.025/0.01) my question: why are the concentrations halved? is it because the lactic acid and sodium lactate are added together rather than already being in the same container?