In carbonate ion, there is two oxygen atoms which has -1 charge on each of them. Lewis Structure for CO 3 2- Carbonate ion Lewis structure of carbonate ion is drawn in this tutorial step by step.
Carbonate ion CO 3 2- Carbonate ion has a -2 charge. Steps of drawing lewis structure of CO 3 2- Following steps are required to draw the CO 3 2- lewis structure and they are explained in detail in this tutorial. Find total number of electrons of the valance shells of carbon and oxygen atoms Total electrons pairs Center atom selection Put lone pairs on atoms Check the stability and minimize charges on atoms by converting lone pairs to bonds.
Total number of electrons of the valance shells of CO 3 2- Carbon is located at group 4 in the periodic table. Center atom of CO 3 2- ion To be the center atom, ability of having higher valance is important. Lone pairs on atoms There are already three C-O bonds in the above sketch. First, mark those nine valence electrons pairs as lone pairs in outside atoms on oxygen atoms. One oxygen atom will take three lone pairs following the octal rule oxygen atom cannot keep more than eight electrons in its valence shell.
For three oxygen atoms, nine electrons pairs are spent. Now there is no more lone pairs to mark on carbon atoms after marking on oxygen atoms outside atoms.
Charges on atoms After, marking electron pairs on atoms, we should mark charges of each atom. Check the stability and minimize charges on atoms by converting lone pairs to bonds Oxygen atoms should hold negative charges because electronegativity of oxygen atom is higher than carbon atom.
Otherwise, we can say, ability of holding negative charges is greater in oxygen atoms than carbon atoms. The drawn structure is not a stable one because all atoms have a charge Lewis structure should be a stable one with less charges. White precipitates dissolve and give colourless solutions. Then add little amount of sulfuric acid H 2 SO 4. SrSO 4 is a white precipitate.
So you can identify the two compounds magnesium carbonate and barium carbonate when forming final white precipitate is given. Carboxylic acid reacts with bicarbonate ion to give carbon dioxide. But alcohols and phenols do not. You are provided a white solid and one student has found there is calcium metal as the cation.
Now another student says anion should be carbonate ion. Now you have do an experiment which will varyfy there is carbonate ion. Take a piece of white solid and add dilute HCl to it. You can see a colurless gas emits. Send emitting gas to the lime solution. A white precipitate forms. When excess gas is sent, white precipitate dissolves. Check pH value. Metal carbonate compounds are usually weak bases. So pH value is slightly over the 7.
But this test is not enough to prove the presence of carbonate ion. Therefore, add aqueous calcium chloride solution to the carbonate ion solution. You will see a white precipitate forms. CaCO 3.
Metal carbonate solutions are weak bases and have pH values just higher than 7 like 8,9, Compare these pH values with pH of strong bases. It simply means that there are two electrons in a pi bond between two atoms. You get delocalized electrons when you have alternating double bonds in a molecule think benzene , because then you have a system of pi bonds that all overlap, and so the electrons are shared among more than two atoms.
The compounds LiOH, calcium chloride, lithium sulfate, and sodium acetate trihydrate are soluble or dissociate easily in water, and all are strong electrolytes. The weak electrolyte is magnesium carbonate because it is the least soluble compound. Therefore, the correct option is C.
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