Pertanyaan

Seorang siswa melakukan percobaan titrasi asam basa di laboratorium sekolah. Sebanyak 20 mL asam klorida 0 , 2 M dititrasi dengan larutan kalium hidroksida . Adapun volume larutan kaliumhidroksida yang di tambahkan adalah: 0 mL 5 mL 10 mL 15 mL 20 , 2 mL 20 , 5 mL Berdasarkan data tersebut, hitunglah pH larutan setiap penambahan larutan kalium hidroksida !

Seorang siswa melakukan percobaan titrasi asam basa di laboratorium sekolah. Sebanyak $20 mL$ asam klorida $0, 2 M$ dititrasi dengan larutan kalium hidroksida 0 comma 2 space M . Adapun volume larutan kalium hidroksida yang di tambahkan adalah:

$0 mL$
$5 mL$
$10 mL$
$15 mL$
$20, 2 mL$
$20, 5 mL$

Berdasarkan data tersebut, hitunglah pH larutan setiap penambahan larutan kalium hidroksida 0 comma 2 space M !

S. Oktasari

Master Teacher

Mahasiswa/Alumni Universitas Padjadjaran

Jawaban terverifikasi

Jawaban

pH asam klorida saat kalium hidroksidaditambahkan:

asam klorida 0 comma 2 space M

saat kalium hidroksida ditambahkan:

Pembahasan

Titrasi asam basa merupakan suatu proseduryang dilakukan untuk menentukan kemolaran atau kadar suatu asam atau basa berdasarkan reaksi netralisasi. Menghitung pH asam klorida saat kalium hidroksidaditambahkan : Jadi,pH asam klorida saat kalium hidroksidaditambahkan:

Titrasi asam basa merupakan suatu prosedur yang dilakukan untuk menentukan kemolaran atau kadar suatu asam atau basa berdasarkan reaksi space netralisasi.

Menghitung pH 20 space mL asam klorida 0 comma 2 space M saat kalium hidroksida ditambahkan space :

$table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript HCl end cell equals cell fraction numerator mol over denominator vol space total end fraction end cell row blank equals cell fraction numerator 3 space mmol over denominator 20 space mL plus 5 space mL end fraction end cell row blank equals cell 1 comma 2 cross times 10 to the power of negative sign 1 end exponent space M end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell M cross times a end cell row blank equals cell 1 comma 2 cross times 10 to the power of negative sign 1 end exponent cross times 1 end cell row blank equals cell 1 comma 2 cross times 10 to the power of negative sign 1 end exponent space M end cell row blank blank blank row pH equals cell space minus sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 1 comma 2 cross times 10 to the power of negative sign 1 end exponent end cell row blank equals cell 1 minus sign log space 1 comma 2 end cell row blank equals cell 0.92 end cell end table$

$table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript HCl end cell equals cell fraction numerator mol over denominator vol space total end fraction end cell row blank equals cell fraction numerator 2 space mmol over denominator 20 space mL plus 10 space mL end fraction end cell row blank equals cell 6 comma 7 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell M cross times a end cell row blank equals cell 6 comma 7 cross times 10 to the power of negative sign 2 end exponent cross times 1 end cell row blank equals cell 6 comma 7 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank blank blank row pH equals cell space minus sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 6 comma 7 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 6 comma 7 end cell row blank equals cell 1 comma 17 end cell end table$

$table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript HCl end cell equals cell fraction numerator mol over denominator vol space total end fraction end cell row blank equals cell fraction numerator 1 space mmol over denominator 20 space mL plus 15 space mL end fraction end cell row blank equals cell 2 comma 8 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell M cross times a end cell row blank equals cell 2 comma 8 cross times 10 to the power of negative sign 2 end exponent cross times 1 end cell row blank equals cell 2 comma 8 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank blank blank row pH equals cell space minus sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 2 comma 8 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 2 comma 8 end cell row blank equals cell 1 comma 55 end cell end table$

pH equals 7

$table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript KOH end cell equals cell fraction numerator mol over denominator vol space total end fraction end cell row blank equals cell fraction numerator 0 comma 04 space mmol over denominator 20 space mL plus 20 comma 2 space mL end fraction end cell row blank equals cell 9 comma 9 cross times 10 to the power of negative sign 4 end exponent space M end cell row blank blank blank row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell M cross times b end cell row blank equals cell 9 comma 9 cross times 10 to the power of negative sign 4 end exponent cross times 1 end cell row blank equals cell 9 comma 9 cross times 10 to the power of negative sign 4 end exponent space M end cell row blank blank blank row pOH equals cell space minus sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 9 comma 9 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell 4 minus sign log space 9 comma 9 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 4 minus sign log space 9 comma 9 right parenthesis end cell row blank equals cell 10 plus log space 9 comma 9 end cell row blank equals cell 10 comma 99 end cell end table$

$table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript KOH end cell equals cell fraction numerator mol over denominator vol space total end fraction end cell row blank equals cell fraction numerator 0 comma 1 space mmol over denominator 20 space mL plus 20 comma 5 space mL end fraction end cell row blank equals cell 2 comma 5 cross times 10 to the power of negative sign 3 end exponent space M end cell row blank blank blank row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell M cross times b end cell row blank equals cell 2 comma 5 cross times 10 to the power of negative sign 3 end exponent cross times 1 end cell row blank equals cell 2 comma 5 cross times 10 to the power of negative sign 3 end exponent space M end cell row blank blank blank row pOH equals cell space minus sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 2 comma 5 cross times 10 to the power of negative sign 3 end exponent end cell row blank equals cell 3 minus sign log space 2 comma 5 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 3 minus sign log space 2 comma 5 right parenthesis end cell row blank equals cell 11 plus log space 2 comma 5 end cell row blank equals cell 11 comma 40 end cell end table$

Jadi, pH asam klorida saat kalium hidroksida ditambahkan:

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