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Tentukan pH dari larutan garam fluorida berikut jika Ka HF = 7,2 x10-4 (Larutan CaF2 0,036 M) ...

Pertanyaan

Tentukan pH dari larutan garam fluorida berikut jika Ka HF = 7,2 x10-4 (Larutan CaF2 0,036 M) ...space 

Pembahasan Soal:

Reaksi garam:
 

begin mathsize 14px style Ca F subscript 2 yields Ca to the power of 2 plus sign and 2 F to the power of minus sign 0 comma 036 space space 0 comma 036 space space 0 comma 072 end style 
 

Perhitungan pH garam basa yaitu:
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets 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 square root of Kw over Ka cross times open square brackets G close square brackets end root end cell row blank equals cell square root of Kw over Ka cross times open square brackets F to the power of minus sign close square brackets end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 7 comma 2.10 to the power of negative sign 4 end exponent end fraction cross times open square brackets 0 comma 072 close square brackets end root end cell row blank equals cell square root of 1.10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 1.10 to the power of negative sign 6 end exponent end cell row pOH equals cell negative sign log space 1.10 to the power of negative sign 6 end exponent end cell row blank equals 6 row blank blank blank row pH equals cell 14 minus sign 6 end cell row blank equals 8 end table end style 
 

Jadi, dapat disimpulkan jawaban yang tepat adalah 8.space

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 12 April 2021

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