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Pertanyaan

100 mL larutan Ca ( OH ) 2 ​ 0,2 M dicampur dengan 100 mL larutan HF 0,8 M. Hitung pH larutan sebelum dan sesudah dicampurkan ( K a ​ HF = 8 × 1 0 − 4 ) .

100 mL larutan  0,2 M dicampur dengan 100 mL larutan HF 0,8 M. Hitung pH larutan sebelum dan sesudah dicampurkan 
 

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maka jawaban yang tepat adalah sesuai penjelasan di atas.

maka jawaban yang tepat adalah sesuai penjelasan di atas.

Pembahasan

pH larutan sebelum dicampurkan : pH larutan setelah dicampurkan : Dengan demikian, maka jawaban yang tepat adalah sesuai penjelasan di atas.

pH larutan Ca open parentheses O H close parentheses subscript 2 sebelum dicampurkan:

Ca open parentheses O H close parentheses subscript 2 open parentheses aq close parentheses yields Ca to the power of 2 plus sign open parentheses aq close parentheses and 2 O H to the power of minus sign open parentheses aq close parentheses n subscript Ca open parentheses O H close parentheses subscript 2 end subscript equals 0 comma 2 cross times 100 equals 20 space mmol n subscript O H to the power of minus sign end subscript equals 2 cross times n subscript Ca open parentheses O H close parentheses subscript 2 end subscript equals 40 space mmol open square brackets O H to the power of minus sign close square brackets equals bevelled 40 over 100 equals 0 comma 4 space M pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets pOH equals 1 minus sign log space 4 pH equals 13 plus log space 4

pH larutan Ca open parentheses O H close parentheses subscript 2 setelah dicampurkan:

n subscript Ca open parentheses O H close parentheses subscript 2 end subscript equals 0 comma 2 cross times 100 equals 20 space mmol n subscript HF equals 0 comma 8 cross times 100 equals 80 space mmol Ca open parentheses O H close parentheses subscript 2 open parentheses aq close parentheses and 2 H F open parentheses aq close parentheses yields Ca F subscript 2 open parentheses aq close parentheses and 2 H subscript 2 O open parentheses l close parentheses space space 20 space space space space space space space space space space space space space space space space space space space space 80 bottom enclose negative sign 20 space space space space space space space space space space space space space space space space space space space minus sign 40 space space space space space space space space space space plus 20 space space space space space space space space space space plus 40 end enclose space space space 0 space space space space space space space space space space space space space space space space space space space space space 40 space space space space space space space space space space space space space space space space 20 space space space space space space space space space space space space space space space 40 n subscript HF equals 40 space mmol n subscript F to the power of minus sign end subscript equals 2 cross times n subscript Ca F subscript 2 end subscript equals 40 space mmol open square brackets H to the power of plus sign close square brackets equals K subscript a cross times fraction numerator open square brackets H F close square brackets over denominator open square brackets F to the power of minus sign close square brackets end fraction open square brackets H to the power of plus sign close square brackets equals 8 cross times 10 to the power of negative sign 4 end exponent cross times fraction numerator begin display style bevelled 40 over 200 end style over denominator begin display style bevelled 40 over 200 end style end fraction open square brackets H to the power of plus sign close square brackets equals 8 cross times 10 to the power of negative sign 4 end exponent pH equals 4 space minus sign log space 8

Dengan demikian, maka jawaban yang tepat adalah sesuai penjelasan di atas.

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