Question

Consider a 1L, 200mm acetate buffer with pH = 6.0 and with a pKa of 4.73 C) What weight in grams of Sodium Acetate is needed to make this solution? MW Sodium Acetate = 136.08 g/mole > Ratio of ( x ) = 18.62 Instructor's Notes (9/6/19): If you were wondering why this sodium acetate has a higher MW than standard Sodium Acetate, it's because its Sodium Acetate Trihydrate as opposed to anhydrous Sodium Acetatel Take a moment to solve this problem

Answer 1

Solution, The But Sodium Acetic acid + n; The Buftes made acetate. According to the Hem der equation- pH-pkat log [ Sodium Acetate]. ...0 1 [ Acetic acid] The giren value pH = 6.0 : pka = 6.73. Toton Concentration of the acetate butter = 200mm in 1L. . [sodium Acetate] + Cacetic Acid ] = 200 mm . ----@. tuting the value in Equation. ; we get a 6.0 = 4.72 + log [sodium Acetate] o cacetic Acid) a log csodium Acetate? [Acetic Acid] [sodium Acetate ] - 19.6 18.62. . [Acetic acid] en (Acetic acid - [sodium Acetate] 18.62 Puting the value in equation ①; we get - SATUI [sodium Acetate] + [sodium Acetate] x 18 = 200 w, 19.62 ( Sodium Acetate ) = 3724.474 a [sodium acetate] = 1989.815 mm. not The buffes Solution Conterin 189,819 mm sodium Acetate. Again, 3 1 x 103 mm Sodium 1 . Acetate 189.815 sm-p- to-B = 136.08 Im Sodium Acetate 136.08 103 136.08% 189.815 103 uence, 25.83 grams of sodium Ž 25.83 gm Acetate is needed to make butter solution. this