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維他命 C 含量之測定 PowerPoint PPT Presentation


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維他命 C 含量之測定. 郭偉明編畫. 1. 維他命 C 含量之測定. A. 碘溶液之配製. HCl. (1) 精秤約 0.1g 乾燥之 KIO 3 放入 150mL 燒杯中並加入 2g 的 KI 。. (2) 以約 50mL 純水將其完全溶解後再加入 1mL 濃鹽酸。再以定量瓶稀釋至 250mL 。. 3. 維他命 C 含量之測定. B. 維他命 C 之定量. (3) 精秤維他命 C 約 0.3g 以純水溶解之並以量瓶定量稀釋至 100mL 。. (4) 以移液管精取上述溶液 25mL ,再以吸量管加入 1mL3% 偏磷酸溶液,再加入 1mL0.5% 澱粉溶液。.

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維他命 C 含量之測定

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C

維他命C含量之測定

郭偉明編畫


C

1.維他命C含量之測定

A.碘溶液之配製

HCl

(1)精秤約0.1g乾燥之KIO3放入150mL燒杯中並加入2g的KI。

(2)以約50mL純水將其完全溶解後再加入1mL濃鹽酸。再以定量瓶稀釋至250mL。


C

3.維他命C含量之測定

B.維他命C之定量

(3)精秤維他命C約0.3g以純水溶解之並以量瓶定量稀釋至100mL。

(4)以移液管精取上述溶液25mL,再以吸量管加入1mL3%偏磷酸溶液,再加入1mL0.5%澱粉溶液。


C

4.維他命C含量之測定

B.維他命C之定量

(5)用碘溶液滴定至終點,再重複滴定二次,求維他命C之平均值。


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