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. K aHZ = 2.5 x 10 -7

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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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buffer solution
Buffer Solution
  • A solution that resists changes in pH
slide4

Buffer Solution

  • Made from the combination of a weak acid & its salt
slide5

Buffer Solution

  • Made from the combination of a weak base & its salt
slide6

Buffer Examples

  • Mix acetic acid & sodium acetate
  • Mix ammonia & ammonium chloride
slide7

Buffer Solution

  • A buffer solution works best when the acid to salt ratio is
  • 1 : 1
slide8

Buffer Solution

  • A buffer solution works best when the base to salt ratio is
  • 1 : 1
slide9

Buffer Solution

  • The buffering capacity of a solution works best when the pH is near the pKa
slide10

pKa or pKb

  • pKa = - log Ka
  • pKb = - log Kb
slide11

Buffer Problems

  • Calculate the pH of a solution containing 0.10 M HAc in 0.10 M NaAc: Ka = 1.8 x 10-5
slide12

Buffer Problems

  • Calculate the pH of 0.10 M NH3 in 0.20 M NH4NO3:
  • Kb = 1.8 x 10-5
slide13

Buffer Problems

Calculate the pH of a solution containing

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

slide14

Buffer Problems

Calculate the pH of a solution containing

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

slide15

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
Lab Requirements
  • To make accurate measurements, we must have solutions with accurately measured concentrations
standard solution
Standard Solution
  • A solution with known concentration
  • 2.004 M HCl
slide18

STD Problems

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

slide19

Henderson-Hasselbach Eq

[A-]

[HA]

pH = pKa + log

slide20

Henderson-Hasselbach Eq

[B+]

[B]

pOH = pKb+ log

slide21

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
slide22

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
slide24

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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