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The DCPIP method is a redox titration based on the principle that ascorbic acid is a strong reducing agent that can decolorize the blue dye DCPIP. In an acidic solution, DCPIP is blue, and upon reduction by ascorbic acid, it becomes colorless.
“Shalat witir minimal menurut Syafiiyah dan Hambali adalah satu rakaat. Mereka mengatakan, boleh shalat witir satu rakaat dan tidak makruh. Berdasarkan hadis, ‘Shalat malam 2 rakaat – 2 rakaat, apabila kamu khawatir masuk subuh, kerjakan witir satu rakaat.” (Al-Mausu’ah Al-Fiqhiyah, 27/293).
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