Sodium hydroxide and copper sulphate are used for the test of:
fats
starch
vitamins
proteins
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Biuret Test
The reagent used in the Biuret Test is a solution of copper sulfate (CuSO4) and sodium hydroxide (NaOH). The NaOH is there to raise the pH of the solution to alkaline levels; the crucial component is the copper II ion (Cu2+) from the CuSO4.
Copper(II) sulphate – sodium hydroxide reaction
If you slowly add one to the other while stirring, you will get a precipitate of copper(II) hydroxide, Cu(OH)2. ... You can use the amounts of the reactants needed to achieve this point to find the ratio of copper(Il) and hydroxide ions in the two precipitates.
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hey mate your answer is proteins.
hope it helps
hv a nic day ahead duh~
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