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RNH2 stands for class of compounds called
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What is the geometric shape of NH2?
If you are referring to a primary amine (RNH2), the shape of the amine part is pyramidal, unless the R group is aromatic (such as phenylamine), in which case the amine part is planar. If you are referring to the Schiff base (RNH2+), the amine component is also planar. If you are referring to the amide ion (NH2-), this has two lone pairs and is a bent molecule just like water.
Potassium carbonate should not be used as a drying agent for some organic compounds would it be better for use in drying an ether solution containing an acid RCOOH or a base RNH2and why?
Potassium carbonate would be better for drying an ether solution containing an acid RCOOH. This is because potassium carbonate can react with the acid to form a salt, reducing the acidity of the solution. However, it may not be effective in drying a base solution containing RNH2 as it could react with the base to form undesirable byproducts.
What is difference between amine and amide?
An Amine is best defined as a derivative of ammonia (NH3) where one or more N-H bonds are replaced by N-C bonds. Primary amines have one N-H bond replaced by a N-c bond, whereas secondary has two N-C bonds with one N-H bond and tertiary has all three N-C bonds making the molecular formula NC3. An amide is a nitrogen bonded to a carbonyl group.
How does nitride ion react with water?
The Nitride ion N3- will be protonated very quickly in an aqueous solution and is therefor not found in solution under ordinary circumstances. If you look at a molecule of water you see that the electrons spend the majority of the time near the oxygen atom, which means the two hydrogen atoms are (for demonstrative reasons) bare protons. A single hydrogen ion would be pulled from the water molecule and would bond with the N3- ion. Under normal circumstances the reaction should go like this: 3H2O + N3- --> 3OH- + NH3 This is an ideal reaction for the nitride ion, however, it is not likely to happen, what will more often than not happen is this: H2O + N3- --> OH- + NH2- THEN H2O + NH2- --> OH-+ NH2- THEN R + NH2- -->RNH2 OVERALL REACTION: R + 2H2O + N3- --> RNH2 + 2OH- This R group could be any other element present in the solution such as a metal impurity that is capable of bonding with an amine or another hydrogen ion. The reason that the nitride will not take both hydrogen's from a water molecule is because it is much more energetically favorable to take a hydrogen from a new water molecule than it is to pull off the second hydrogen to form O2-. This can occur, but will not unless the nitride is in excess, and this simply would never happen under normal circumstances. Edit: Added an overal reaction and fixed the charges on the second phase of the reaction.
