Question

How many grams of sodium acetate, NaC₂H₃O₂, would have to be added to 1.0 L of 0.30 M acetic acid (pK_a = 4.74) to make the solution a buffer for pH 4.00?

_____g NaC₂H₃O₂

Answer 1

the Henderson er for the solution containing a weart assa Chcoolt and its salt ctz coona is given by — - pH = pka tlog - t - skatoa [4 Loowa] Tak COOH on 4 = 4.74 tlog - 0.30 Cos woona] - 1-74 tua CDONG). = 0.30 = tebuorra - o 10-0.74 А и, соо мо] =0 s +59 м

. [cli coon] = 0.05459 m = 0.05459 molle 18 12 soln contain 0.05459 mol of soleum acetate. now melarmers of cli coorra is 82.0343 g moliy le imol of cly coorra = 82.03438 u 11 sola contam (0.05489x82.0343 g ie, approximately 40489 of sodium acetate, acctate.