When you blow into the straw, you exhale carbon dioxide which reacts with the water, phenol red, and sodium bicarbonate to form carbonic acid. This causes a color change in the phenol red indicator due to the change in pH from the carbonic acid production. The sodium bicarbonate buffer helps maintain a stable pH during the reaction.
Phenol is not miscible in tris buffer because phenol is a hydrophobic compound, while tris buffer is an aqueous solution. Hydrophobic compounds like phenol tend to separate from water-based solutions like tris buffer due to differences in polarity and interactions with water molecules. This results in the immiscibility of phenol in tris buffer.
Phenol red is a pH indicator that changes color in response to pH changes. It turns yellow in acidic conditions and red in basic conditions. When added to a solution containing baking soda (sodium bicarbonate), which is a basic substance, phenol red can turn red.
When Calcium chloride reacts with phenol red and baking soda, it will generate carbon dioxide gas. This reaction causes the phenol red to change color – it will turn from red to yellow as the pH decreases due to the formation of carbonic acid.
The reaction between phenol red, calcium chloride, and baking soda is endothermic. The mixture will absorb heat from its surroundings as it undergoes the reaction, causing the temperature of the mixture to decrease.
When baking soda (NaHCO3) reacts with calcium chloride (CaCl2), it forms calcium carbonate (CaCO3), water (H2O), and carbon dioxide (CO2). Phenol red is a pH indicator that changes color based on the pH of the solution, and it does not participate in the chemical reaction.
Phenol is not miscible in tris buffer because phenol is a hydrophobic compound, while tris buffer is an aqueous solution. Hydrophobic compounds like phenol tend to separate from water-based solutions like tris buffer due to differences in polarity and interactions with water molecules. This results in the immiscibility of phenol in tris buffer.
Equilibrated phenol is phenol that has been mixed with an appropriate buffer solution to maintain a specific pH. This helps to stabilize the phenol solution and make it suitable for various biological applications, such as DNA extraction and purification.
Phenol red is a pH indicator that changes color in response to pH changes. It turns yellow in acidic conditions and red in basic conditions. When added to a solution containing baking soda (sodium bicarbonate), which is a basic substance, phenol red can turn red.
When Calcium chloride reacts with phenol red and baking soda, it will generate carbon dioxide gas. This reaction causes the phenol red to change color – it will turn from red to yellow as the pH decreases due to the formation of carbonic acid.
when you mix all three you get a chemical change. you also get heat and bubbles witch indicates that there is gas!
carbon dioxide
tribromophenol is formed.
It is a chemical change because it produces heat which is evidence that a chemical change has occured.
tribromophenol is formed.
The reaction between phenol red, calcium chloride, and baking soda is endothermic. The mixture will absorb heat from its surroundings as it undergoes the reaction, causing the temperature of the mixture to decrease.
When baking soda (NaHCO3) reacts with calcium chloride (CaCl2), it forms calcium carbonate (CaCO3), water (H2O), and carbon dioxide (CO2). Phenol red is a pH indicator that changes color based on the pH of the solution, and it does not participate in the chemical reaction.
In the reaction between phenol and sodium metal, sodium donates an electron to the oxygen atom in the phenol molecule, forming a sodium phenoxide salt and hydrogen gas. This process is a type of redox reaction where the sodium is oxidized and the phenol is reduced.