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The ingredients:
Copper(II)Sulfate: Created with copper and sulfuric acid.
as described here http://www.sciencefo...ead.php?t=10342
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ANY metal will not suffice, it has to be Copper.
dump the acid from a car battery into a large plastic bowl.
leave it for an hour for the particulate matter to settle, then pour the liquid through a large funnel with a coffee filter in it, into a large jar.
then get some copped pipe offcuts from a plumber, or just any old copper that`s quite thick that nobody wants and use that instead, whatever.
you`ll need a car battery charger, clamp one lead onto one copper peice and the other lead onto another copper peice then put them in you jar that contains the filtered acid.
making 100% sure both copper peices DO NOT touch!, you may turn the power on and leave it for a day or 2.
check every now and then that the electrodes haven`t dissolved.
the liquid will turn Blue :)
after 2 days disconnect the power, drop the copper electrodes in the jar, put the lid on and leave it for a week.
pour the liquid out after this time into a large based bowl to evaporate the water, the crystals that form will be your copper sulphate :)
dump the acid from a car battery into a large plastic bowl.
leave it for an hour for the particulate matter to settle, then pour the liquid through a large funnel with a coffee filter in it, into a large jar.
then get some copped pipe offcuts from a plumber, or just any old copper that`s quite thick that nobody wants and use that instead, whatever.
you`ll need a car battery charger, clamp one lead onto one copper peice and the other lead onto another copper peice then put them in you jar that contains the filtered acid.
making 100% sure both copper peices DO NOT touch!, you may turn the power on and leave it for a day or 2.
check every now and then that the electrodes haven`t dissolved.
the liquid will turn Blue :)
after 2 days disconnect the power, drop the copper electrodes in the jar, put the lid on and leave it for a week.
pour the liquid out after this time into a large based bowl to evaporate the water, the crystals that form will be your copper sulphate :)
Sodium Carbonate:
Help! how should I get this?
Sodium Citrate:
Help! how should I get this?
Sodium Citrate dihydrate
After All Ingredients are gathered
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Benedict's Reagent: We generally use a commercial reagent, but to make it from scratch, first dissolve 100 g sodium carbonate and 173 g sodium citrate dihydrate in a final volume of 850 mL water. Slowly, with stirring, add a solution of 17.3 g copper sulfate pentahydrate in 100 mL of water. Bring the final volume to one liter. The commercial reagent, at least, seems to be stable for years.
When 1 mL of reagent is heated with 5 drops of sample in a boiling water bath, a positive test for reducing sugars is formation of a precipitate within five minutes. The color ranges from green to yellow to orange to brick-red depending on the amount of reducing sugar in the sample; with a sample containing 1% glucose, the precipitate is usually brick-red.
When 1 mL of reagent is heated with 5 drops of sample in a boiling water bath, a positive test for reducing sugars is formation of a precipitate within five minutes. The color ranges from green to yellow to orange to brick-red depending on the amount of reducing sugar in the sample; with a sample containing 1% glucose, the precipitate is usually brick-red.
I found this from searching on the internet. But I am having a little bit of trouble understanding this.
When they say 173 g of "sodium citrate dihydrate" would this include the mass of 2 H2O molecules with each molecule of Sodium citrate dihydrate?
and when thay say "17.3 g copper sulfate pentahydrate in 100 mL of water"
is the 100ml of water beyond the 5 water molecules for each molecule of Copper sulfate?
(17.3g of Coper Sulfate) + (6 molecules of water for each molecule of coper sulfate) + (an additional 100ml of water)
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