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Pertanyaan

Hitunglah N H subscript 4 Cl yang terlarut di dalam 200 mL air jika diketahui bahwa larutan tersebut mempunyai pH = 5 dan K subscript b space N H subscript 4 O H equals 1 cross times 10 to the power of negative sign 5 end exponentleft parenthesis Ar space N equals 14 semicolon space H equals 1 semicolon space Cl equals 35 comma 5 right parenthesis.

D. Santika

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Pembahasan

Jumlah N H subscript 4 Cl yang terlarut di dalam 200 mL air jika diketahui bahwa larutan tersebut mempunyai pH = 5 adalah 1,07 gram.

Hidrolisis garam adalah reaksi antara air dan ion-ion yang berasal dari asam lemah atau basa lemah suatu garam.

N H subscript 4 Cl merupakan garam yang terdiri dari basa lemah (kation) dan asam kuat (anion), reaksi ionisasi garam sebagai berikut:

N H subscript 4 Cl yields N H subscript 4 to the power of plus plus Cl to the power of minus sign space space M space space space space space space space space space space M  

Garam yang terdiri dari basa lemah dan asam kuat, garam tersebut bersifat asam. Untuk mencari gram N H subscript 4 Cl yang terlarut, dapat melalui tahapan berikut:

mengubah pH ke dalam open square brackets H to the power of plus sign close square brackets:

table attributes columnalign right center left columnspacing 0px end attributes row pH equals 5 row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 5 end exponent end cell end table 

menghitung open square brackets N H subscript 4 Cl close square brackets equals open square brackets N H subscript 4 to the power of plus close square brackets 

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 square root of K subscript w over K subscript b cross times open square brackets N H subscript 4 to the power of plus close square brackets end root end cell row cell 10 to the power of negative sign 5 end exponent end cell equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 cross times 10 to the power of negative sign 5 end exponent end fraction cross times open square brackets N H subscript 4 to the power of plus close square brackets end root space space space left parenthesis kuadratkan space kedua space ruas right parenthesis end cell row cell open parentheses 10 to the power of negative sign 5 end exponent close parentheses squared end cell equals cell open parentheses square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 cross times 10 to the power of negative sign 5 end exponent end fraction cross times open square brackets N H subscript 4 to the power of plus close square brackets end root close parentheses squared end cell row cell 10 to the power of negative sign 10 end exponent end cell equals cell 10 to the power of negative sign 9 end exponent cross times open square brackets N H subscript 4 to the power of plus close square brackets end cell row cell open square brackets N H subscript 4 to the power of plus close square brackets end cell equals cell 10 to the power of negative sign 10 end exponent over 10 to the power of negative sign 9 end exponent end cell row blank equals cell 0 comma 1 space M end cell row cell open square brackets N H subscript 4 to the power of plus close square brackets end cell equals cell open square brackets N H subscript 4 Cl close square brackets equals 0 comma 1 space M end cell end table 

menghitung gram N H subscript 4 Cl:

table attributes columnalign right center left columnspacing 0px end attributes row cell 0 comma 1 end cell equals cell fraction numerator gram over denominator 53 comma 5 end fraction cross times 1000 over 200 end cell row cell 0 comma 1 end cell equals cell fraction numerator gram over denominator 53 comma 5 end fraction cross times 5 end cell row gram equals cell fraction numerator 53 comma 5 cross times 0 comma 1 over denominator 5 end fraction end cell row blank equals cell 1 comma 07 space gram end cell end table 

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