data pengamatan dan perhitungan kolori
DESCRIPTION
data pengamatanTRANSCRIPT
DATA PENGAMATAN DAN PERHITUNGAN
Data Pengamatan Praktikum
Perlakuan HasilPenambahan larutan standar yaitu feri amonium sulfat sebanyak 0.1 ml, 0.2 ml, 0.5 ml, 1.0 ml, dan 2.5 ml pada masing-masing labu ukur 10 ml
kemudian pada labu ukur lainnya dimasukkan sampel yaitu air mineral VIT , air godokan, dan air AQUA masing-masing sampel dianalisis tiplo yaitu sebanyak 0.5 ml, 1 ml, dan 2.5 ml
Ditambahkan hidroksi 100 mikro liter, fenatrolin 0.5 ml, dan Na asetat 0.8 ml, lalu diamkan selama 15 menit
Kemudian larutan sampel dan standar diukur dengan spektrofotometri visible.
Data Pengamatan Absorbansi
Hasil Absorbansi Standar
0.1 ppm 0,2 ppm 0,5 ppm 1,0 ppm 2,5 ppm Blanko (Aqua bidest)
Absorbansi 1 0.2143 0.2647 0.4059 0.5005 0.5948 0,0001
Absorbansi 2 0.2142 0.2647 0.4061 0.5006 0.5946 0,0001
Absorbansi 3 0.2141 0.2648 0.4062 0.5006 0.5947 0,0003
Rata-rata 0.2142 0.264733333 0.406066667 0.50057 0.5947 0,00016
Hasil Absorbansi sampel Air VIT (Sampel 1)
0,5 ppm 1,0 ppm 2,5 ppm
Absorbansi 1 -0.0032 -0.0049 -0.0028
Absorbansi 2 -0.0032 -0.0048 -0.0028
Absorbansi 3 -0.0033 -0.0048 -0.0031
Rata-rata -0.003233333 -0.00483333 -0.0029
Hasil Absorbansi sampel Air GODOKAN (Sampel 2)
0,5 ppm 1,0 ppm 2,5 ppm
Absorbansi 1 -0.0038 -0.0051 -0.0035
Absorbansi 2 -0.0038 -0.0051 -0.0035
Absorbansi 3 -0.0038 -0.0049 -0.0035
Rata-rata -0.0038 -0.00503333 -0.0035
Hasil Absorbansi sampel Air AQUA (Sampel 3)
0,5 ppm 1,0 ppm 2,5 ppm
Absorbansi 1 -0.0046 -0.0064 -0.0058
Absorbansi 2 -0.0046 -0.0063 -0.0058
Absorbansi 3 -0.0047 -0.0063 -0.0058
Rata-rata -0.004633333 -0.00633333 -0.0058
TABEL ABSORBANSI RATA-RATA
Perhitungan kurva kalibrasi
standar
Berdasarkan perhitungan dengan
menggunakan kalkulator didapatkan
hasil :
Natrium : a = 0.14
b = 0.27
r = 0,9013
y = ax + b
y = 0.1452x + 0.27
PERHITUNGAN
Konsentrasi Fe2+ dalam sampel :
Sampel Air VIT (Sampel 1)
0,5 ppm
y = 0.1452x + 0.27
y1 (0,5ppm) = -0.00323
-0.00323 = 0.1452x +
0.27
0.1452x = -0.00323 -
0.27
X1(0,5ppm) = -0.27323 ppm
1,0 ppm
y = 0.1452x + 0.27
y1 (1,0ppm) = -0.00483
-0.00483 = 0.1452x + 0.27
0.1452x = -0.00483 - 0.27
X1(1,0ppm) = -0.27483 ppm
2,5 ppm
y = 0.1452x + 0.27
y1 (2,5ppm) = -0.0029
--0.0029 = 0.1452x +
0.27
0.1452x =-0.0029 - 0.27
X1(2,5ppm) = -0.2729 ppm
C Absorbansi Rata-rataBlanko 0,00016Standar 0,1 ppm 0.2142
0,2 ppm 0.264730,5 ppm 0.4060671,0 ppm 0.500572,5 ppm 0.5947
Sampel 1 0,5 ppm -0.003231,0 ppm -0.004832,5 ppm -0.0029
Sampel 2 0,5 ppm -0.00381,0 ppm -0.005032,5 ppm -0.0035
Sampel 3 0,5 ppm -0.004631,0 ppm -0.006332,5 ppm -0.0058
Sampel Air GODOKAN (Sampel 2)
0,5 ppm
y = 0.1452x + 0.27
y2 (0,5ppm) = -0.0038
-0.0038 = 0.1452x + 0.27
0.1452x = -0.0038 - 0.27
X2(0,5ppm) = -0.2738 ppm
1,0 ppm
y = 0.1452x + 0.27
y2 (1,0ppm) = -0.00503
-0.00503 = 0.1452x + 0.27
0.1452x -0.00503 - 0.27
X2(1,0ppm) = -0.27503 ppm
2,5 ppm
y = 0.1452x + 0.27
y2 (2,5ppm) = -0.0035
-0.0035 = 0.1452x + 0.27
0.1452x = -0.0035 - 0.27
X2(2,5ppm) = -0.2735 ppm
Sampel Air AQUA (Sampel 3)
0,5 ppm
y = 0.1452x + 0.27
y3 (0,5ppm) = -0.00463
-0.00463 = 0.1452 x + 0.27
0.1452 x = -0.00463 – 0.27
X3(0,5ppm) = -0.27463 ppm
1,0 ppm
y = 0.1452x + 0.27
y3 (1,0 ppm) = -0.00633
-0,00633 = 0.1452 x + 0.27
0.1452 x = -0.00633 – 0.27
X3(1,0ppm) = -0.27633 ppm
2,5 ppm
y = 0.1452x + 0.27
y3 (2,5 ppm) = -0.0058
-0.0058 = 0.1452 x + 0.27
0.1452 x = -0.0058 – 0.27
X3(2,5ppm) = -0.2758 ppm
