Term
| How do you find glucose in something? |
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Definition
| Use benedicts solution, add a few drops to a sample in a test tube then warm gently over a bunsen flame, if positive for glucose will turn orange |
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Term
| How do you find starch in something? |
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Definition
| Use iodine solution, add a few drops to a sample in a testube, if positive for starch will turn black/purple |
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Term
| How do you find lipids(fat) in something? |
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Definition
| Use brown paper(butchers paper), rub a small sample onto the centre of the paper and hold up to the light, if positive for lipids the paper will turn clear/transparent |
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Term
| How do you find protein in something? |
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Definition
| Add 2-3ml of sodium hydroxideto a small sample, then add a few drops of copper sulphate solution, gently heat if no reaction, if positive for protein it will turn purple |
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Term
| How do you find sodium chloride in something(salt)? |
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Definition
| Add silver nitrate to a sample, if positive for salt it will turn milky white |
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Term
| How do you find lignen in something? |
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Definition
| Cover sample with Phluoroglucinol solution and leave for a few minutes, then add a few drops of HCl solution, if positive for lignen then it will turn red |
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