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Popescu200
a fost răspuns

COROANA!!!!
Calculeaza partea de masa de KOH in solutia obtinuta prin amestecarea a 100g de solutie KOH de 10% cu 50g solutie de KOH de 50%.

Răspuns :

ms1=100g KOH
Cp1=10%
ms2=50g
Cp2=50%
1. Din Cp1 scoti md1 =>md1=Cp1*ms1/100=10*100/100=10g
2. Din Cp2 scoti md2 =>md2=Cp2*ms2/100=50*50/100=25g
mdf=md1+md2=10+25=35g
msf=ms1+ms2=100+50=150g
3. Calculezi Cpf=>
Cpf=mdf/msf*100=35/150*100=23.33%

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