Prepare acetate buffer solution at pH=3.5
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Take 25 g of ammonium acetate, dissolve it in 25 ml of water, then add 38 ml of hydrochloric acid (7 mol/L). Adjust the pH to 3.5 using hydrochloric acid (2 mol/L). How much of the 2 mol/L hydrochloric acid solution is needed? This post was last edited by hwqckr on 2009-3-7 22:44]
Since it is a buffer solution, the calculation results may not be useful! Let’s decide after it’s actually prepared! ! !
In fact, it is entirely possible to make the calculation using the ionization equilibrium constant of acetic acid. However, the purpose of using hydrochloric acid (2 mol/L) for precise adjustment is to avoid errors that may occur during the preparation process; precise pH test strips are used to determine the concentration drop by drop until the desired pH value is reached.