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

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

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

Buffer Solution

- 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

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

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

- 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

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