a) The combustion of an organic compound in the presence of excess oxygen produced a gas , which makes clear lime water turbid. What element can be identified?
b) A sample of this compound is treated with hot molten sodium metal, the obtained mixture is dissolved in water and is then filtered.
To a portion of the obtained filtrate an iron ll nitrate solution is added, followed by adding an iron lll nitrate solution and a compound is formed which gives a blue color to the solution.
Write the formula of the compound and give its name.
Thank you.
a) The gas produced when an organic compound combusts in the presence of excess oxygen and makes clear lime water turbid is carbon dioxide (CO2).
b) The formula of the compound formed when a portion of the filtrate is treated with an iron II nitrate solution, followed by an iron III nitrate solution, and gives a blue color to the solution is Fe4[Fe(CN)6]3. Its name is Prussian Blue.
a) The gas produced when an organic compound undergoes combustion in the presence of excess oxygen and makes lime water turbid is carbon dioxide (CO2).
To identify the element, you can follow these steps:
1. Write down the balanced equation for the combustion reaction of the organic compound. For example:
Organic compound + O2 → CO2 + H2O
2. Identify the product gas in the balanced equation, which is carbon dioxide (CO2).
3. Carbon dioxide is known to make lime water (calcium hydroxide solution) turbid. So, when you pass the gas through lime water, it will turn cloudy or turbid, indicating the presence of carbon dioxide.
b) When a sample of the organic compound is treated with hot molten sodium metal, it results in the formation of a mixture that is then dissolved in water and filtered. Afterward, iron(II) nitrate solution is added, followed by iron(III) nitrate solution.
To determine the formula and name of the compound formed, follow these steps:
1. Start by balancing the equation for the reaction between the organic compound and sodium metal. For example:
Organic compound + 2Na → Na2O + CO2 + H2
2. The product of interest is carbon dioxide (CO2), as determined in part a.
3. In the subsequent steps, iron(II) nitrate (Fe(NO3)2) and iron(III) nitrate (Fe(NO3)3) solutions are added. This indicates that the compound formed should involve iron.
4. The compound formed when iron(II) nitrate and iron(III) nitrate are combined is called Prussian blue. Its chemical formula is Fe4[Fe(CN)6]3.
In summary, the formula of the compound formed is Fe4[Fe(CN)6]3, and its name is Prussian blue.