How do you make a buffer with an assigned pH and concentration? To answer the question,...
How do you make a buffer with an assigned pH and concentration? To answer the question, please provide a step-by-step outline.
Homework Answers
A buffer solution is basically a mixture of a weak acid and its conjugate base or a mixture of a weak base and its conjugate acid, whose pH changes very little when acid or base is added to it.
To make a buffer Solution, there are different ways
1st:
1. The acid form of the buffer is added to 60% of the total volume
of water
2. pH is measured.
3. pH is adjusted using a strong conjugate base and desired conc.
is obtained.
2nd:
1. Both the acid solution and the base solution is prepared of
conc. same as buffer conc.
2. They are added while monitoring pH of the entire buffer.
3. And desired conc is obtained.
3rd:
Using the equation of Henderson-Hesselbach,
that is,
pH= pKa + log { [conjugate base]/[weak acid] }
the conc of the weak acid and its conjugate base is determined for desired buffer pH.
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How do you make a buffer with an assigned pH and
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using ammonium nitrate: pKa= 9.24
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of 9.2
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2 Introduiction The Henderson-Hasselbalch equation, or A-1 HAl relates the pH of a buffer with the pKo of the acid and the concentration of the conjugate base A- and the monoprotic acid HA. In cq. (1), pH-_ log[H+], pK, =-log Ka, and [J]i and [JIe are the initial and equilibrium molar concentration of the Jth species, respectively. The buffering capacity of the buffer is given by [1] Ka H+ where K,e-1.0 ×...
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In lab if you must make a buffer of pH=3.5, which of the following buffer systems would be best? How much of each species would you need in order to make 100ml of this buffer? 0.1M CH3COOH 0.1M NH3 0.1M KH2P04 0.1M NaCH3COO 0.1M NH4Cl 0.1M K2HPO4 *Please show all steps thank you!
4. If you want to make a buffer of 4.5 pH, how many grams of NaF do you need to add to 300 mL of 0.4 M HF solution? (Ka=7.1x10-4) Answer: 114.66 grams Pka -log (7.1 X10-4) = 3.1487411651 234
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