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E-MODUL ASAM & BASA
Berbasis Guided Discovery Learning
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Menghitung [OH ] larutan basa lemah
1. Ditinjau dari tanda panah yang ada pada reaksi (3) , reaksi tersebut tergolong
reaksi (...........................) sehingga berlaku hukum (...........................).
2. Bagaimanakah hukum kesetimbangan dari reaksi (3)?
Jawab:.................................................................................................................
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3. Jika [H O] adalah konstanta, sehingga K[H O] menghasilkan suatu tetapan
2
2
baru yaitutetapan asam (Ka), turunkanlah formula untuk mencari nilai Ka
untuk reaksi (3) !
Jawab:.................................................................................................................
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+
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+
4. Jika untuk basa lemah [BH ], [OH ] dan [A ] dianggap sama, sehingga [BH ]
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= [OH ]. Maka turunkanlah rumus Kb di atas sehingga didapatkan rumus
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[OH ]
Jawab:.................................................................................................................
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Verification
a. Cara menentukan pH asam.....................................................................
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b. Cara menentukan pH basa.....................................................................
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Kelas XI SMA/MA 57
