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Chemistry, 07.12.2021 14:00 annjetero2oy23ay
Lấy 5ml dd hồ tinh bột vào ông nghiệm, thêm 4 giọt dd H2SO4 10%. Lắc kỹ, đun sôi 20 phút. cứ mỗi 5 phút lấy ra 5 giọt dd đnag đun cho vào ống nghiệm khác nhau. Để nguội, nhỏ 1-2 giọt dd iod. Quan sát, nhận xét, giải thích. Đến khi dd kong có màu với dd iod nữa thì ngừng đun. Để nguội, lấy 5 giọt dd thủy phân vào ống nghiệm. Trung hòa bằng NaOH , kểm tra bàng giấy quỳ. Thêm 5 giọt thuốc thử Fehling, lăc kỹ, đun cách thủy sôi nhẹ 5-7 phút. Quan sát, nhận xét, giải thích
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Lấy 5ml dd hồ tinh bột vào ông nghiệm, thêm 4 giọt dd H2SO4 10%. Lắc kỹ, đun sôi 20 phút. cứ mỗi 5 p...
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