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Because this solution contain copper(II) sulfate.
Sodium carbonate is added to increase the pH of the solution.
Benedicts solution
The iodine stain solution you're referring to might be Lugol's iodine. This is iodine and potassium iodide in water. The product available in a pharmacy is tincture of iodine which is iodine and potassium iodide in ethanol and water. Please see the links.
It is normally benedicts solution. Add about 1/4 of the total sugar solution to a test tube and heat it in a hot water bath at around 50 degrees C for 5 min. For example, heat 40mL of sugar water (C12H22O11 aq ) with 10mL of Benedicts soluton (copper and sodium salts). If it is a positive test it will turn yellow.
Simple(sugar): benedicts solution. Turns bright orange. Complex(starch): iodine turns dark purple/black
catalys
Glucose
Starch solution.
prosrdure of benidect solution test
Because this solution contain copper(II) sulfate.
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A solution of iodine is covalent.
Iodine crystal is solid Iodine. Iodine solution is when Iodine crystals are dissolved in water.
iodine
will ribose turn benedicts solution red
Otherwise a solvent is stated, a solution of iodine contains only iodine molecules.