Answer to Question #177349 in General Chemistry for mel

Question #177349

Determination of % KPH in unknown mixture


Trail 1:

mass of sample: 0.600 g

buret reading 

final: 16.00 mL

initial: ?

NaOH used: ?


Trail 2:

mass of sample: 0.600 g

buret reading 

final: 15.50 mL

initial: ?

NaOH used: ?


Trail 3:

mass of sample: 0.600 g

buret reading 

final: 15.80 mL

initial: ?

NaOH used: ?


find initial buret reading for trail 1,2,and 3.

calculate mass of KPH and percent KPH.


1
Expert's answer
2021-04-02T05:11:03-0400
Vtotal=16.00+15.50+15.80=47.3mLV_{total} = 16.00+15.50+15.80 = 47.3 mL

Vˉ=15.77mL\bar{V} = 15.77 mL

If c(NaOH) = 0.1M:


n(NaOH)=0.001577moln(NaOH) = 0.001577 mol

n(KHP)=0.001577moln(KHP) = 0.001577 mol

m(KHP)=204.22g/mol0.001577mol=0.322gm(KHP) = 204.22g/mol*0.001577 mol = 0.322 g

%KHP = 53.67 %KHP = 53.67%


%KHP = 53.67


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