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V. HASIL PENGAMATAN DAN PEMBAHASAN 5.1 Hasil Pengamatan Tabel 1. Hasil pengamatan pembuatan larutan buffer Kelompok pH Berat garam (g) Volume asam (ml) pH meter Kertas pH 6 5 5,2388 2,0857 5,16 5 7 4,5 2,9205 3,6857 4,07 4 8 4 1,2205 4,8691 3,49 4 9 4,8 4,3042 2,725 4,34 5 10 5,5 6,9754 0,88 5,27 5 (Sumber : Dokumentasi Pribadi, 2012) Perhitungan : Kelompok 6 pH= 5 pH = pK a + log [ Basa Konjugat ] [ Asam] 5 = 4,76 + log ( x 1− x ) log ( x 1− x ) = 0,24 ( x 1− x ) = 1,7378 x = 1,7378 – 1,7378x 2,7378x = 1,7378 x = 0,6347 (garam) Garam : [ Garam ] = massa Mr . 1000 V ( ml) 0,6347 = massa 82, 5 . 1000 100 Massa = 5,2388 gram Asam : [ Asam ] = massa Mr . 1000 V ( ml) 0,0365 = massa 60 . 1000 100 Massa = 2,19 gram V asam = massa ρ

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V. HASIL PENGAMATAN DAN PEMBAHASAN 5.1 Hasil PengamatanTabel 1. Hasil pengamatan pembuatan larutan bufferKelompok pHBerat garam (g)Volume asam (ml)pH meterKertas pH

655,23882,08575,165

74,52,92053,68574,074

841,22054,86913,494

94,84,30422,7254,345

105,56,97540,885,275

(Sumber : Dokumentasi Pribadi, 2012)Perhitungan:Kelompok 6

pH= 5

pH = pKa + log

5 = 4,76 + log

log = 0,24

= 1,7378x = 1,7378 1,7378x2,7378x = 1,7378x = 0,6347 (garam)

Garam :

= .

0,6347 = .Massa = 5,2388 gram

Asam :

= .

0,0365 = .Massa = 2,19 gram

V asam =

V asam =

V asam = 2,0857 ml

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