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Sebanyak 50 mL larutan HX 0,4 M direaksikan dengan 50 mL larutan Ba(OH) 2 0,2 M. Maka pH larutan tersebut adalah ... (K a = 2 × 1 0 − 5 )

Sebanyak 50 mL larutan HX 0,4 M direaksikan dengan 50 mL larutan Ba(OH)2 0,2 M. Maka pH larutan tersebut adalah ... (Ka=)

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A. Nurul

Master Teacher

Mahasiswa/Alumni UIN Syarif Hidayatullah Jakarta

Jawaban terverifikasi

Pembahasan

menentukan mol masing-masing larutan : menentukan mol garamyang terbentuk: menentukan ion garam yang terhidrolis : menentukan konsentrasi garam terhidrolisis : menentukan nilai [OH - ]: menentukan pH larutan : Jadi , pH larutan adalah 9.

menentukan mol masing-masing larutan :

n space HX space equals space M cross times V space space space space space space space space equals 0 comma 4 space cross times 50 space space space space space space space space equals 20 space mmol

n space Ba open parentheses O H close parentheses subscript 2 space equals M cross times V space space space space space space space space space space space space space space equals 0 comma 2 space cross times 50 space space space space space space space space space space space space space space equals 10 space mmol

menentukan mol garam yang terbentuk :

menentukan ion garam yang terhidrolis :

CaX subscript 2 yields space space space space space Ca to the power of 2 plus sign plus space space space 2 X to the power of minus sign 10 space mmol space space 10 space mmol space 20 space mmol 

menentukan konsentrasi garam terhidrolisis :

V space total space equals 50 plus 50 equals 100 M equals fraction numerator n over denominator V space total end fraction M equals 20 over 100 M equals 0 comma 2 space M 

menentukan nilai [OH-]:

open square brackets O H to the power of minus sign close square brackets equals square root of K subscript w over K subscript a end root cross times open square brackets garam close square brackets open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction end root cross times left square bracket 0 comma 2 right square bracket open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction end root cross times left square bracket 2 cross times 10 to the power of negative sign 1 end exponent right square bracket open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator 2 cross times 10 to the power of negative sign 15 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction end root open square brackets O H to the power of minus sign close square brackets equals square root of 10 to the power of negative sign 10 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 5 end exponent 

menentukan pH larutan :

pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log left square bracket 10 to the power of negative sign 5 end exponent right square bracket pOH equals 5  pH space equals space 14 minus sign pOH pH space equals space 14 minus sign 5 pH space equals space 9 

Jadi, pH larutan adalah 9.

 

 

 

 

 

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