Question

1.Determine the pH change when 0.126 mol KOH is added to 1.00 L of a buffer solution that is 0.445 M in HCN and 0.213 M in CN-. pH after addition pH before addition = pH change = 2. Consider how best to prepare one liter of a buffer solution with pH = 9.58 using one of the weak acid/conjugate base systems shown here. Weak Acid Conjugate Base Ka pKa HC2O4- C2O42- 6.4 x 10-5 4.19 H2PO4- HPO42- 6.2 x 10-8 7.21 HCO3- CO32- 4.8 x 10-11 10.32 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams potassium salt of weak acid = grams potassium salt of conjugate base =

          1.Determine the pH change when 0.126 mol KOH is added to 1.00 L of a buffer solution that is 0.445 M in HCN and 0.213 M in CN-.
pH after addition  pH before addition = pH change =
2. Consider how best to prepare one liter of a buffer solution with pH = 9.58 using one of the weak acid/conjugate base systems shown here.  Weak Acid         Conjugate Base          Ka        pKa 
HC2O4-            C2O42-                    6.4 x 10-5       4.19
 H2PO4-            HPO42-                  6.2 x 10-8         7.21
 HCO3-              CO32-                     4.8 x 10-11      10.32  
 How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base?  
grams potassium salt of weak acid =    
grams potassium salt of conjugate base =

Added by Irene H.

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