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Sebanyak 100 mL NH4​OH 0,1 M dicampur dengan 400 mL larutan NH4​OH 0,2 M lain. Hitung pH larutan campuran! (Kb​=5×10−7)

Pertanyaan

Sebanyak 100 mL N H subscript 4 O H 0,1 M dicampur dengan 400 mL larutan N H subscript 4 O H 0,2 M lain. Hitung pH larutan campuran! open parentheses K subscript b equals 5 cross times 10 to the power of negative sign 7 end exponent close parentheses 

Q. 'Ainillana

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Jawaban

maka jawaban yang tepat adalah 10 + log 3.

Pembahasan

n subscript N H subscript 4 O H open parentheses 1 close parentheses end subscript equals 0 comma 1 cross times 100 equals 10 space mmol n subscript N H subscript 4 O H open parentheses 2 close parentheses end subscript equals 0 comma 2 cross times 400 equals 80 space mmol n subscript N H subscript 4 O H open parentheses total close parentheses end subscript equals 10 plus 80 equals 90 space mmol open square brackets N H subscript 4 O H close square brackets equals 90 over 500 equals 0 comma 18 space M open square brackets O H to the power of minus sign close square brackets equals square root of K subscript b cross times open square brackets N H subscript 4 O H close square brackets end root open square brackets O H to the power of minus sign close square brackets equals square root of 5 cross times 10 to the power of negative sign 7 end exponent cross times 0 comma 18 end root open square brackets O H to the power of minus sign close square brackets equals square root of 9 cross times 10 to the power of negative sign 8 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 3 cross times 10 to the power of negative sign 4 end exponent space M  pOH equals minus sign log open parentheses 3 cross times 10 to the power of negative sign 4 end exponent close parentheses pOH equals 4 minus sign log space 3  pH equals 14 minus sign open parentheses 4 minus sign log space 3 close parentheses pH equals 10 plus log space 3

Dengan demikian, maka jawaban yang tepat adalah 10 + log 3.

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Tentukan pH campuran antara 200 mL larutan NH4​OH 0,1 M bereaksi dengan 100 mL larutan  0,2 M. Jika Kb NH4​OH=10−5.

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