Give an example of the components of a buffer solution, including concentrations of the components. Then,...
Homework Answers
Answer:
buffer solution example:
sodium acetate + acetic acid
assume typical concentration of 0.5 M for Acetic acid, and 0.5 M for sodium acetate
then,
the pH equation
pH = pKa + log(acetate/Acetic acid)
since acetate = Acetic acid, then acetate/Acetic acid = 1
log(1) = 0
pH = pKa (acetic acid)
pH = 4.75
the pH will be on point, i.e. the 50-50% ratio
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Give an example of the components of a buffer solution, including
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what concentrations of CH3COO- and CH3COOH of those
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HELP!!! The Henderson-Hasselbalch (Buffer) Equation • The pH of the buffer solution is dependent more on...
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Generally, common buffers have concentrations of the acid and base components that are between 0.1 M...
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Resources Ex Give Up? What concentrations of acetic acid (pka = 4.76) and acetate would be required to prepare a 0.15 M buffer solution at pH 4.92 Note that the concentration, the pH, or both values may differ from that in the first question. Strategy 1. Rearrange the Henderson-Hasselbalch equation to solve for the ratio of base (acetate) to acid (acetic acid), [ A HA). 2. Use the mole fraction of acetate to calculate the concentration of acetate. 3. Calculate...
what concentrations of CH3COO- and CH3COOH of those
below would give a buffer with a pH of 4.11 (pKa=
CH3COOH=4.84)
Br What concentrations of [CH3COO 1 and [CH1COOH1 of those below would give a buffer with a pH of 4.11? (pKa CH3COOH = 4.84). 10 a) (CH3COO]-0.15 M, [CH3COOH] = 0.10 M b) [CH3COO]-0.10 M, [CH3COOH] = 0.53 M c) [CH3COO]-0.46 M, [CH3COOH]= 0.10 M d) [CH3COO]- 0.23 M, [CH3COOH] = 0.10 M 14
9. 15.00 mL of 0.100 M NaOH are added to 50.00 mL of a buffer solution containing 1.0 mmol CH3COOH and 1.0 mmol CH3C00-. What is the new solution pH? (a) 11.89 (b) 2.11 (c) 7.87 (d) Can't tell / need more info. 10. The equilibrium constant for the below reaction is 4.2 x 10 Which of the following statements is FALSE? CuBr (s) = Cu+ (aq) + Br- (aq) (a) CuBr has poor solubility in water. (b) If 15.0...
HELP!!!
The Henderson-Hasselbalch (Buffer) Equation • The pH of the buffer solution is dependent more on pk, of the buffer than concentrations of acids and bases • As a rule, this equation is only useful if HA and A differ by less than a factor of 10 The K, of HCN is 4.9 x 10 What is the pH of a buffer solution that is 0.100 Min HCN and (0.200 M in KCN? Calculate the pH of a buffer which...
Resources Ex Give Up? What concentrations of acetic acid (pka = 4.76) and acetate would be required to prepare a 0.15 M buffer solution at pH 4.92 Note that the concentration, the pH, or both values may differ from that in the first question. Strategy 1. Rearrange the Henderson-Hasselbalch equation to solve for the ratio of base (acetate) to acid (acetic acid), [ A HA). 2. Use the mole fraction of acetate to calculate the concentration of acetate. 3. Calculate...
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