Benedict's Reagent - Thuốc thử Benedict, Trung Quốc

Benedict's Reagent - Thuốc thử Benedict

Xuất xứ: Phygene - Trung Quốc

Mã hàng: PH0796

Đóng gói: 100mL/ 500mL

Bảo quản ở nhiệt độ phòng, hạn sử dụng 12 tháng từ ngày sản xuất

Giới thiệu: 

Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent named after American chemist Stanley Rossiter Benedict.

Benedict's solution is a deep-blue solution used to test for the presence of the aldehyde functional group, - CHO. It is an aqueous alkaline mixture of CuSO4 and sodium citrate. Here sodium citrate is the complexing agent that keeps Cu2+ in solution, which would otherwise precipitate as cupric carbonate. The substance to be tested is heated up to 95 °C (for example, in a water bath) with Benedict's solution; formation of a brick-red precipitate indicates presence of the aldehyde group in relatively high concentrations. Since simple sugars (e.g., glucose) give a positive test, the solution is used to test for the presence of glucose in urine, a sign of diabetes. One litre of Benedict's solution contains 173 grammes sodium citrate, 100 grammes sodium carbonate, and 17.3 grammes cupric sulphate pentahydrate. It reacts chemically similarly to Fehling's solution; the cupric ion (complexed with citrate ions) is reduced to cuprous ion by the aldehyde group (which is oxidised), and precipitates as cuprous oxide, Cu2O.