Part B How many grams of dry NH4Cl need to be added to 2.40 L...

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Chemistry

Part B How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH of 8.66? Kb for ammonia is 1.8Ã—10âˆ’5. Express youranswer with the appropriate units.
mass of NH4Cl = ?

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3.8 Ratings (456 Votes)

Pkb = -logKb

Â Â Â Â Â Â Â = -log1.8*10^-5

Â Â Â Â Â Â Â Â = 4.75

PHÂ Â = 8.66

POH = 14-PH

Â Â Â Â Â Â Â Â Â Â = 14-8.66Â Â = 5.34

no of moles of NH3 = molarity * volume in L

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.8*2.4 = 1.92 moles of NH3

POHÂ Â Â = Pkb + log[NH4Cl]/[NH3]

5.34Â Â = 4.75 + log[NH4Cl]/1.92

log[NH4Cl]/1.92Â Â Â = 5.34-4.75

log[NH4Cl]/1.92Â Â = 0.59

[NH4Cl]/1.92Â Â Â Â = 10^0.59

[NH4Cl]/1.92Â Â Â Â = 3.8904

[NH4Cl]Â Â Â Â Â Â Â Â Â Â Â = 3.8904*1.92Â Â = 7.4695 moles

mass of NH4ClÂ Â = no of moles * gram molar mass

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 7.4695*53.5Â Â = 399.62g >>>> answer

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Part B How many grams of dry NH4Cl need to be added to 2.40 L...

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70.2K

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Chemistry

Part B How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH of 8.66? Kb for ammonia is 1.8Ã—10âˆ’5. Express youranswer with the appropriate units.
mass of NH4Cl = ?

Answer & Explanation Solved by verified expert

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Part B How many grams of dry NH4Cl need to be added to 2.40 L...

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Chemistry

Part B How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH of 8.66? Kb for ammonia is 1.8Ã—10âˆ’5. Express youranswer with the appropriate units.mass of NH4Cl = ?

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Part B How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH of 8.66? Kb for ammonia is 1.8Ã—10âˆ’5. Express youranswer with the appropriate units.
mass of NH4Cl = ?