0.170 M NaOH 용액 42.0 mL와 0.400 M NaOH 용액 37.6 mL

0.170 M NaOH 용액 42.0 mL와 0.400 M NaOH 용액 37.6 mL

 

 

혼합 용액에 존재하는 이온의 농도는?

42.0 mL of 0.170 M NaOH and 37.6 mL of 0.400 M NaOH

 

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[1]

(0.170 mol/L) × (42.0/1000) L = 0.00714 mol NaOH

NaOH → Na^+ + OH^-

NaOH : Na^+ : OH^- = 1 : 1 : 1 계수비(= 몰수비)

 

 

[2]

(0.400 mol/L) × (37.6/1000) L = 0.01504 mol NaOH

NaOH → Na^+ + OH^-

NaOH : Na^+ : OH^- = 1 : 1 : 1 계수비(= 몰수비)

 

 

[3]

[Na^+] = (0.00714 + 0.01504) mol / (42.0/1000 + 37.6/1000) L

= 0.279 M = [OH^-]