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Hitunglah pH larutan yang terjadi jika 100 mL laru...

Hitunglah pH larutan yang terjadi jika 100 mL larutan asam yang mempunyai pH = 1 dicampur dengan 50 mL larutan basa yang mempunyai pH = 13 ?space

Jawaban:

Untuk menghitung pH campuran dari larutan asam-basa, dengan langkah-langkah berikut :

1) tentukan molaritas asam dan basa tersebut :

   begin mathsize 14px style pH equals 1 space left parenthesis asam space kuat right parenthesis pH equals minus sign log space open square brackets H to the power of plus sign close square brackets 1 equals minus sign log space open square brackets H to the power of plus sign close square brackets open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 1 end exponent space M open square brackets H to the power of plus sign close square brackets equals M subscript a cross times a 10 to the power of negative sign 1 end exponent equals M subscript a cross times 1 M subscript a equals 10 to the power of negative sign 1 end exponent space M end style              begin mathsize 14px style pH equals 13 space left parenthesis basa space kuat right parenthesis pH and pOH equals 14 pOH equals 14 minus sign 13 equals 1 pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets 1 equals minus sign log space space open square brackets O H to the power of minus sign close square brackets space open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 1 end exponent space M space open square brackets O H to the power of minus sign close square brackets equals M subscript b cross times b space 10 to the power of negative sign 1 end exponent equals M subscript b cross times 1 M subscript b equals 10 to the power of negative sign 1 end exponent space M end style   

2) Persamaan reaksi asam-basa:

misal : begin mathsize 14px style HX end style (asam kuat) dan begin mathsize 14px style LOH end style (basa kuat).

begin mathsize 14px style mol space HX double bond M cross times V equals 10 to the power of negative sign 1 end exponent cross times 100 equals 10 space mmol mol space LOH double bond M cross times V equals 10 to the power of negative sign 1 end exponent cross times 50 equals 5 space mmol end style

3) Pada reaksi asam-basa diatas, mmol asam begin mathsize 14px style HX end style yang bersisa maka pH yang terbentuk masih pH asam kuat. Rumus untuk menentukan pH asam adalah :

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals M cross times a open square brackets H to the power of plus sign close square brackets equals fraction numerator 5 space mmol over denominator 150 space mL end fraction cross times 1 open square brackets H to the power of plus sign close square brackets equals 3 comma 3 cross times 10 to the power of negative sign 2 end exponent space M pH equals minus sign log space open square brackets H to the power of plus sign close square brackets pH equals minus sign log space open parentheses 3 comma 3 cross times 10 to the power of negative sign 2 end exponent space close parentheses pH equals 2 minus sign log space 3 comma 3 end style

Maka, pH campuran yang dihasilkan adalah 2-log 3,3.space

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