Buffer Solutions

Buffer Solutions

Drill: Determine the pH of 0.25 M HZ. -7 KaHZ = 2.5 x 10 Buffer

Solutions Buffer Solution A solution that resists changes in pH

Buffer Solution Made from the combination of a weak acid & its salt

Buffer Solution Made from the combination of a weak base & its salt

Buffer Examples Mix acetic acid & sodium acetate Mix ammonia & ammonium chloride

Buffer Solution A buffer solution works best when the acid to salt ratio is 1:1

Buffer Solution A buffer solution works best when the base to salt ratio is 1:1

Buffer Solution The buffering capacity of a solution works best when the pH is near the pKa

pKa or pKb pKa = - log Ka pKb = - log Kb Buffer Problems

Calculate the pH of a solution containing 0.10 M HAc in 0.10 M NaAc: Ka = 1.8 x 10-5

Buffer Problems Calculate the pH of 0.10 M NH3 in 0.20 M NH4NO3: Kb = 1.8 x 10-5

Buffer Problems Calculate the pH of a solution containing 0.10 M HBz in 0.20 M NaBz: Ka = 6.4 x 10-5

Buffer Problems Calculate the pH of a solution containing 0.50 M HQ in 0.10 M NaQ: Ka = 4.0 x 10-5

Drill Calculate the pH of a solution containing 0.30 M HZ in 0.10 M

NaZ: Ka = 3.0 x 10-5 Lab Requirements To make accurate measurements, we must have solutions with

accurately measured concentrations Standard Solution A solution with known concentration

2.004 M HCl STD Problems Calculate the mass of KHP (MW = 204.23)

required to make 1.0 L of 0.100 M KHP HendersonHasselbach Eq [A-] pH = pKa + log [HA]

HendersonHasselbach Eq [B+] pOH = pKb+ log [B] Buffer Problems

Calculate the salt to acid ratio to make a buffer solution with pH = 5.0 Ka for HBZ = 2.0 x 10-5

Buffer Problems Calculate the salt to base ratio to make a buffer solution with pH = 9.48 Kb for MOH = 2.0 x 10-5

Calculate the HCO3- to H2CO3 ratio in blood with pH = 7.40 Ka1 for H2CO3 = 4.4 x 10-7 150 ml of 0.10 M NaOH is

added to 100.0 ml of 0.10 M H2CO3. Calculate all. Ka1 for H2CO3 = 4.4 x 10-7 Ka2 for H2CO3 = 4.7 x 10-11

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