It doesn't decolourize on heating and go to a temperature of 240
the melting/ freezing point is approximately 50°C
sodium chloride melt earlier because it has low freezing point
Paraffin is a commonly used material for determining the melting point of organic compounds because it has a well-defined melting point of 54-57°C and does not react with most organic compounds. This makes it a suitable medium for accurately measuring the melting points of various substances without interference.
Each time fresh paraffin liquid should be taken in the experiment of determining melting point to ensure accurate and consistent results. Reusing the same sample may introduce impurities or contaminants, leading to inaccurate melting point measurements. Using fresh paraffin liquid each time helps to eliminate any potential variables that could affect the melting point determination.
The melting point of a mixture of 50% 2-naphthol and 50% benzoic acid will depend on the exact proportion of each compound present and any potential interactions between them. However, the melting points of the individual compounds are approximately 122°C for 2-naphthol and 122-123°C for benzoic acid.
physical change
Benzoic acid has a high melting point because it forms strong intermolecular hydrogen bonds between its molecules. These bonds require a lot of energy to break, resulting in a high melting point. Additionally, benzoic acid molecules are relatively large and exhibit a high degree of symmetry, contributing to its strong intermolecular forces.
Benzoic Acid has a melting point of 122oC. If your sample did not melt even at 200oC, then you can only assume that the sample in Whole or Part was not Benzoic Acid. It must have been contaminated with some other compound with a much higher melting point.
the melting/ freezing point is approximately 50°C
The student's approach to isolating and testing the purity of benzoic acid is appropriate, as recrystallization is a common method for purifying solids. After scraping the dried benzoic acid from the filter paper, taking the melting point is a valid method for assessing purity; pure substances have a sharp melting point range, while impurities typically depress and broaden this range. If the observed melting point of the recrystallized benzoic acid closely matches the literature value for pure benzoic acid, it suggests successful purification. Conversely, a significant deviation would indicate the presence of impurities.
sodium chloride melt earlier because it has low freezing point
Paraffin is a commonly used material for determining the melting point of organic compounds because it has a well-defined melting point of 54-57°C and does not react with most organic compounds. This makes it a suitable medium for accurately measuring the melting points of various substances without interference.
Each time fresh paraffin liquid should be taken in the experiment of determining melting point to ensure accurate and consistent results. Reusing the same sample may introduce impurities or contaminants, leading to inaccurate melting point measurements. Using fresh paraffin liquid each time helps to eliminate any potential variables that could affect the melting point determination.
Yes, it is possible to reuse paraffin wax by melting it down and filtering out any impurities before using it again.
The melting point of a mixture of 50% 2-naphthol and 50% benzoic acid will depend on the exact proportion of each compound present and any potential interactions between them. However, the melting points of the individual compounds are approximately 122°C for 2-naphthol and 122-123°C for benzoic acid.
Liquid paraffin is used in the determination of melting point because it has a known and consistent melting point of around 40-60°C. This allows for a reliable reference point to calibrate and set the temperature of the melting point apparatus before testing other substances. Liquid paraffin also has a low volatility, ensuring that it remains stable throughout the duration of the experiment.
Benzoic acid sublimes and transforms directly from a solid to a gas when heated without melting. This process is driven by the compound's low vapor pressure and is commonly used for purification purposes.