air dan bufer
TRANSCRIPT
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Air dan Bufer
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Air adalah wahanakehidupan
Reaksi biokimia menggunakan mediaair
Kesetimbangan masukan dan luaran Sumber air:
Air
Air metabolik (100 g karbohidratmenghasilkan 41,55 g air)
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Struktur dan sifat fisik air
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Ada kekuatan antarmolekul
Sifat dipolar
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Senyawa Tetapan dielektrika (D)
Air 80
Metanol 33
Etanol 24
Amonia 17
Asam asetat 6
Klorofrom 4
Etil eter 4
Benzena 2
Karbon tetra klorida 2
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Ikatan hidrogen
Ikatan hidrogendalam sistem hidup
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Kepentingan biologi air
Menjaga suhu sistem Pelarut senyawa ionik maupun
molekuler organik
Sebagai pereaksi reaksi biokimia
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Interaksi denganmolekul amfifatik
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Disosiasi air dan pH
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pH
Menentukan konsentrasi H+ dan OH-
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Bufer
Campuran asam basa konjugat yangmampu menahan pH
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Bufer dalam sistem hidup
pH darah (arteri 7,36-7,40; vena 7,38-7,42)
H2CO3 dengan HCO3-
Asam basa hemoglobin teroksidasi(HHbO2)
Asam basa hemoglobin terdeoksidasi(HHb)
Sitoplasma (bufer fosfat)
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