Perhitungan
3
- Perhitungan. a. Pembuatan larutan. NaOH 6M 20 ml. M = gr Mr X 1000 V 6M = gr 40 g / mol X 1000 20 ml = 4.8 gram. PbSO4 . 1 gram dalam 10 ml. Amilum 1%. 0.2 gram dalam 20 ml. Na 2 S 2 O 3 0.1 ml dalam 20 ml. M = gr Mr X 1000 V 0.1M = gr 156 g / mol X 1000 20ml = 0.3120 gram. Iodin Iodin = 0.5 g KI + 0.3174 g I2 dilarutkan dalam 250 ml aquadest. b. Perhitungan kadar Vitamin C. % Vitamin C = mlIodXMIodXMr.Iod. 10 −3 BeratSampel X 100%
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- Perhitungan.a. Pembuatan larutan.
NaOH 6M 20 ml.
M = grMr X
1000V
6M = gr
40 g/mol X 100020ml
= 4.8 gram.
PbSO4 .
1 gram dalam 10 ml.
Amilum 1%.0.2 gram dalam 20 ml.
Na2S2O3 0.1 ml dalam 20 ml.
M = grMr X
1000V
0.1M = gr
156g /mol X 100020ml
= 0.3120 gram.
Iodin
Iodin = 0.5 g KI + 0.3174 g I2 dilarutkan dalam 250 ml aquadest.
b. Perhitungan kadar Vitamin C.
% Vitamin C = ml Iod XM Iod XMr . Iod .10−3
Berat Sampel X 100%
% Vitamin C Tomat Segar.
% Vitamin C = (0.70ml−0.10ml ) X 0.0134M X257.8 g /mol .10−3
20.0582gram X 100%
= (0.60ml ) X 0.0134M X257.8 g /mol .10−3
20.0582gram X 100%
= 2.072710−3
20.0582gram X 100 % = 0.0103%.
% Vitamin C Tomat Rebus.
% Vitamin C = (0.80ml−0.10ml ) X 0.0134M X257.8 g /mol .10−3
20.0711gram X 100%
= (0.70ml ) X 0.0134M X257.8 g /mol .10−3
20.0711 gram X 100%
= 2.4182 10−3
20.0711gram X 100 % = 0.0121%.
% Vitamin C Jambu Biji Merah.
% Vitamin C = (2.17ml−0.70ml ) X 0.0134M X257.8 g /mol .10−3
20.0859 gram X 100%
= (2.07ml ) X 0.0134M X 257.8g /mol .10−3
20.0859 gram X 100%
= 0.1216%.
% Vitamin C Jambu Biji Rebus.
% Vitamin C = (2.43ml−0.10ml ) X 0.0134M X257.8 g/mol .10−3
20.0500 gram X 100%
= (2.33ml ) X 0.0134M X257.8 g/mol .10−3
20.0500 gram X 100%
= 2.418210−3
20.0500gram X 100 % = 0.0121%.
