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How many grams of dry NH4Cl need to be added to 2.10 L of a 0.400...

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Chemistry

How many grams of dry NH4Cl need to be added to 2.10 L of a0.400 M solution of ammonia, NH3, to prepare a buffer solution thathas a pH of 8.58? Kb for ammonia is 1.8×10−5. Express your answerwith the appropriate units.

Answer & Explanation Solved by verified expert
4.2 Ratings (492 Votes)

PH = 8.58

POH = 14-PH

        = 14-8.58 = 5.42

PKb = -logKb

        = -log1.8*10-5

       = 4.75

n0 0f moles of NH3 = molarity * volume in L

                              = 0.4*2.1 = 0.84 moles

POH = PKb + log [salt]/[base]

5.42 = 4.75 + log[NH4Cl]/0.84

5.42-4.75   = log[NH4Cl]/0.84

0.67           = log[NH4Cl]/0.84

[NH4Cl]/0.84 = 100.67   = 4. 678

[NH4Cl]    = 4.678*0.84 = 3.9295 moles

mass of NH4Cl = no of moles * gram molar mass

                       = 3.9295*53.5 = 210.2gm >>>> answer
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