Explain preparation of acidic buffer solution with example.

1.	Explain preparation of acidic buffer solution with example.
Answer» Solution :With the help of `pK_a` and `pK_a` of acid and base the ratio of salt acid or salt and base regulated and buffer solution is prepare . For preparation of acidic butter weak acid HA and its salt with strong base is taken , the pH of solution is given by - `pH=pK_a + "log" ([A^-])/([HA])` If `[HA]=[A^-]` than log `([A^-])/([HA])`= log 1=0 `therefore pH=pK_a` Hence if weak and CONJUGATE base have same concentration than pH is equal to `pK_a`. "So to prepare buffer with desire pH SELECT such acid whose `pK_a` value is near to pH value." The `pK_a` of acetic acid is 4.76 . Therefore the pH of buffer SOLUTIONWHICH made by same molar concentration containing solution of acidic acid and sodium acetate , is approximately NEARER to 4.76 To PRODUCE buffer solution, take the concentration of weak acid and its conjugate base equal.

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