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Buffer pH by Design Given that Kb = 5.6×10-4 for ethylamine: To prepare exactly 450 mL...

Buffer pH by Design

Given that Kb = 5.6×10-4 for ethylamine:
To prepare exactly 450 mL of a buffer solution which has a pH of 10.89 and a final ethylammonium chloride salt concentration [CH3CH2NH3+] = 0.120 M. What mass of CH3CH2NH3Cl(s), would be needed and volume of 3.00 M sodium hydroxide solution needed plus enough water to make up the total volume.

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Expert Solution

For basic buffer solution

The final concentration of salt (ethylammonium chloride) is 0.120 M

Total concentration

Hence, we need 0.286 M ethyl ammonium chloride and 0.166 M NaOH.

Total volume

Volume of 3.00 M NaOH required

Number of moles of ethylammonium chloride

Molar mass of ethyl ammonium chloride is 81.5 g/mol.

Mass of ethylammonium chloride

queen_honey_blossom answered 2 years ago
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