Tuesday
July 29, 2014

Homework Help: ionic or covalent

Posted by Hodgkin on Monday, June 19, 2006 at 1:26pm.

can you check for me?

Calcium Chloride: covalent
Citric Acid: ionic
Phenyl Salicylate: covalent
Potassium Iodide: ionic
Sodium Chloride: covalent
Sucrose: ionic

Thanks so much!!!!


You must have some reason for picking ionic or covalent. How did you arrive at your answers? Look at the electronegativity chart. For example, I see a value of 1.00 for Ca and 3.16 for Cl. The difference is 3.16 - 1.00 = 2.16. The general rule is that a range for the difference in EN of 1.7-2.1 represents 50% ionic/50% covalent character. Some profs use 1.7 and some use 2.1 while others use some number in between for the dividing line. Use the number your teacher uses. Anyway, for compounds with greater than 50% ionic character, we usually call them ionic. For less than 2.1 we call them covalent. I would call CaCl2, based on these numbers, ionic. Please rethink and redo your question and repost if you still have a problem.


I have changed my answers i hope they are right can you double check?
Calcium Chloride: ionic
Citric Acid: covalent
Phenyl Salicylate: covalent
Potassium Iodide: covalent
Sodium Chloride: covalent
Sucrose: covalent


Please see:

http://hyperphysics.phy-astr.gsu.edu/Hbase/molecule/nacl.html

Please see:

http://members.aol.com/profchm/ionic.html

Then tell us why you chose Covalent for Potassium Iodide


but are the rest right?


No, but these answers are closer than the first set. See the sites suggested by Lance, then write in the electronegativity values and post them, give the difference, and suggest ionic or covalent.


Calcium Chloride: ionic
Citric Acid: covalent
Phenyl Salicylate: covalent
Potassium Iodide: ionic
Sodium Chloride: ionic
Sucrose: covalent



good. There is a way of getting a good handle on this without looking up the EN values. Compounds formed from group I or II metals with group VI or VII non-metals usually are far enough apart in EN to give ionic compounds. So CaCl2 (group II and group VII) we would expect to be ionic. KI (group I and group VII) same thing. NaCl (group I and group VII) same thing. Compounds formed between elements very close to each other or say between the middle of the table and either side (that is between group IV, for example, and group I or group VII) we would expect to be covalent. So CH4 (group IV and I) is covalent. CCl4 (group IV and VII) is covalent. CO, CO2, Cl2, etc are covalent. Citric acid is an organic molecule composed of C, H, and O. Those are close together. Covalent. Phenyl salicylate is composed of C, H, O, as is sucrose (C12H22O11) and they are covalent. I hope this helps.


citric acid is ionic as it releases hydrogen ions and the anion citrate

Calcium Chloride-ionic
Citric acid-ionic
Phenyl Salicylate-covalent
Potassium iodide-Ionic
Sodium Chloride-ionic
Sucrose-Covalent

CaCl-Ionic
KI-Ionic
Sucrose-Covalant
NaCl-Ionic
Citric Acid-Covalant
Phenyl-Salicylate-Covalant

lalalalala!!!

you guys are silly!!

why do you say that???

the answers are as follows!!!

Calcium Chloride-Pirate
Citric acid-Wednesday
Phenyl Salicylate-Orange
Potassium iodide-three hundred three
Sodium Chloride-303
Sucrose-.....i didn't get this one, it was too hard.















ha!

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