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50 ml HCl 0,1 M dititrasi dengan NaOH 0,1 M, hitung pH pada saat penambahan : 30 mL penambahan larutan NaOH

Pertanyaan

50 ml HCl 0,1 M dititrasi dengan NaOH 0,1 M, hitung pH pada saat penambahan :

30 mL penambahan larutan NaOHspace 

E. Dwihermiati

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

pH larutan setelah penambahan 30 ml NaOH adalah 1,61.space 

Pembahasan

Titrasi asam kuat oleh basa kuat:

begin mathsize 14px style n space H Cl equals 50 space ml cross times 0 comma 1 space M equals 5 space mmol n space Na O H equals 30 space ml cross times 0 comma 1 space M equals 3 space mmol end style 
 

begin mathsize 14px style space space space space space space space space H Cl and Na O H yields Na Cl and H subscript 2 O m space colon space space space space 5 space space space space space space space space space space space 3 space space space space space space space space space minus sign space space space space space space space space minus sign bottom enclose b space space colon space space space space 3 space space space space space space space space space space space 3 space space space space space space space space space space 3 space space space space space space space space space 3 space end enclose s space space colon space space space space 2 space space space space space space space space space space space minus sign space space space space space space space space space 3 space space space space space space space space space 3 end style 

Karena yang bersisa adalah asam kuat, maka menghitung pH menggunakan rumus asam kuat.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row M equals cell n over Vtotal end cell row blank equals cell fraction numerator 2 space mmol over denominator 80 space ml end fraction end cell row blank equals cell 0 comma 025 space M end cell row blank equals cell 2 comma 5 cross times 10 to the power of negative sign 2 end exponent space M end cell end table end style 
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell a cross times Ma end cell row blank equals cell 1 cross times 2 comma 5 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 comma 5 cross times 10 to the power of negative sign 2 end exponent end cell end table end style 
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 2 comma 5 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 2 comma 5 end cell row blank equals cell 2 minus sign 0 comma 39 end cell row blank equals cell 1 comma 61 end cell end table end style 
 

Jadi, pH larutan setelah penambahan 30 ml NaOH adalah 1,61.space 

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Jawaban terverifikasi

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