무게 분석, gravimetric analysis: Al(OH)3

무게 분석, gravimetric analysis: Al(OH)3

 

 

0.200 M Al(NO3)3 50.0 mL를 0.100 M KOH 200.0 mL에 가했을 때, 생성되는 고체 수산화알루미늄의 질량은 얼마인가?

 

What mass of solid aluminum hydroxide can be produced when 50.0 mL of 0.200 M Al(NO3)3 is added to 200.0 mL of 0.100 M KOH?

 

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균형 맞춘 반응식

Al(NO3)3 + 3KOH → Al(OH)3 + 3KNO3

 

0.200 mol/L × 0.0500 L = 0.0100 mol Al(NO3)3

0.100 mol/L × 0.2000 L = 0.0200 mol KOH

 

Al(NO3)3 : KOH = 1 : 3 = ? : 0.0200

? = 0.00667 mol Al(NO3)3

⇨ 한계 시약(limiting reagent)은 KOH

 

KOH : Al(OH)3 = 3 : 1 = 0.0200 : ?

? = 0.00667 mol Al(OH)3

 

Al(OH)3의 몰질량 = 78 g/mol

0.00667 mol × (78 g/mol) = 0.520 g Al(OH)3