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# Drill: Determine the pH of 0.25 M HZ. K aHZ = 2.5 x 10 -7 - PowerPoint PPT Presentation

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

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• A solution that resists changes in pH

• Made from the combination of a weak acid & its salt

• Made from the combination of a weak base & its salt

• Mix acetic acid & sodium acetate

• Mix ammonia & ammonium chloride

• A buffer solution works best when the acid to salt ratio is

• 1 : 1

• A buffer solution works best when the base to salt ratio is

• 1 : 1

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

pKa or pKb

• pKa = - log Ka

• pKb = - log Kb

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

• Calculate the pH of 0.10 M NH3 in 0.20 M NH4NO3:

• Kb = 1.8 x 10-5

Calculate the pH of a solution containing

0.10 M HBz in 0.20 M NaBz: Ka = 6.4 x 10-5

Calculate the pH of a solution containing

0.50 M HQ in 0.10 M NaQ: Ka = 4.0 x 10-5

Calculate the pH of a solution containing

0.30 M HZ in 0.10 M NaZ: Ka = 3.0 x 10-5

• To make accurate measurements, we must have solutions with accurately measured concentrations

• A solution with known concentration

• 2.004 M HCl

Calculate the mass of KHP (MW = 204.23) required to make 1.0 L of 0.100 M KHP

[A-]

[HA]

pH = pKa + log

[B+]

[B]

pOH = pKb+ log

• Calculate the salt to acid ratio to make a buffer solution with pH = 5.0

• Ka for HBZ = 2.0 x 10-5

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