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How will Phenolphthalein help you test for unknown substances?
Phenolphthalein is a pH indicator that changes color in response to different pH levels. By using phenolphthalein, you can determine if a solution is acidic or basic based on the color change it exhibits. This can help you identify unknown substances by comparing the color change with known pH values of different substances.
If an unknown molecule turned light blue with Benedict's solution violet with Biuret solution and yellow with IKI what type of biological molecule would this be?
The unknown molecule is likely a protein, as indicated by the violet reaction with Biuret solution, which tests for the presence of peptide bonds. The light blue color with Benedict's solution suggests the presence of reducing sugars, but the yellow color with IKI (iodine solution) indicates the presence of starch or other polysaccharides. Therefore, the molecule may be a complex mixture containing proteins and carbohydrates, possibly indicating a glycoprotein or a similar compound.
How would you test an unknown solutions for protein?
The biuret test is a chemical test used for detecting the presence of peptide bonds. In the presence of peptides, a copper(II) ion forms violet-colored coordination complexes in an alkaline solution.[1] Several variants on the test have been developed.The Biuret reaction can be used to assay the concentration of proteins because peptide bonds occur with the same frequency per amino acid in the peptide. The intensity of the color, and hence the absorption at 540 nm, is directly proportional to the protein concentration, according to the Beer-Lambert law.
When CuSo4 solution is placed in a beaker containing water it turns blue?
The blue color of the CuSO4 solution is due to the presence of copper ions. When placed in water, these copper ions form a complex with water molecules, resulting in a blue color. This phenomenon occurs due to the absorbance of certain wavelengths of light by the complex formed between copper ions and water molecules.
Magnesium ribbon is put into blue copper sulphate solution the solution becomes colourless and a pinkish metal is produced?
When magnesium ribbon is put into a blue copper sulphate solution, a single displacement reaction occurs. The magnesium displaces the copper ions, forming magnesium sulfate and elemental copper. The blue color of the solution fades because copper ions are removed and the pinkish metal produced is the elemental copper that settles at the bottom of the container.
What color found when red and litmus paper is placed in a basic solution?
Blue.
What is titration technique?
Titration is a laboratory technique used to determine the concentration of an unknown solution by reacting it with a solution of known concentration. A burette is used to carefully add the known solution to the unknown solution until a chemical reaction reaches completion, indicated by a color change or other observable signal. The volume of the known solution added is used to calculate the concentration of the unknown solution.
what happens when You place a drop of a solution on red litmus paper and No color change occurs What do you conclude?
If there is no color change when a drop of solution is placed on red litmus paper, it indicates that the solution is neutral. This means that the solution has a pH around 7, neither acidic nor basic.
What is the reaction of milk with Congo red?
when congo red was mixed with milk it produced pink color solution.
You are given an unknown solution and asked to determine if it is an acid or base You test the solution with a piece of litmus paper You notice the litmus paper turns blue in color This tells you t?
The solution is a base. ( If it turned red, then the solution would be classified as an acid.)
How is a titration carried out?
In a titration, a solution of known concentration (the titrant) is slowly added to a solution of unknown concentration until the reaction is complete. This reaction can be monitored using an indicator that changes color when the reaction is complete. The volume of titrant required to complete the reaction can then be used to determine the concentration of the unknown solution.
How will Phenolphthalein help you test for unknown substances?
Phenolphthalein is a pH indicator that changes color in response to different pH levels. By using phenolphthalein, you can determine if a solution is acidic or basic based on the color change it exhibits. This can help you identify unknown substances by comparing the color change with known pH values of different substances.
What is the colour of copper metal after being placed in silver nitrate solution?
Copper metal will turn a silver color when placed in silver nitrate solution due to a displacement reaction where silver ions (Ag+) from the solution form solid silver metal on the surface of the copper.
What is a natural acid/base indicator and how does it function in determining the pH of a solution?
A natural acid/base indicator is a substance that changes color in response to the acidity or alkalinity of a solution. It functions by undergoing a color change based on the pH level of the solution it is placed in. This color change can help determine the pH of the solution, with different colors indicating different pH levels.
What is the color produced when you add the phenolphthalien to sodium hydroxide solution?
The color produced when you add phenolphthalein to sodium hydroxide solution is pink or magenta. Phenolphthalein is commonly used as an acid-base indicator, turning pink in basic solutions with a pH greater than 8.
What was the color produced when ferrous ion reacted with potassium ferricyanide?
The color produced when ferrous ion reacts with potassium ferricyanide is a deep blue color. This reaction is commonly used in chemical tests to detect the presence of ferrous ions in a solution.
How do you determine the concentration of ascorbic acid in unknown sample?
first measure the volume of the sample solution needed to change the blue color of the DCPIP solution into colourless. then, weigh the mass of the sample solution. finally calculate the concentration by using the formula: volume required t change the color of DCPIP solution (dm) per mass of the sample solution (g)
