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| How to find moles of Cations | | Published by: admin 2008-11-24 |
| | Could you please help me set up this problem... How many moles cations
are in 1.45 mol of K2SO4? I am not sure how to set this problem up...
Thank you
Sorry How many moles of cations
Quantitative Analysis Chemistry? The solubility products for a series ::
Which hydroxide has (a) the lowest molar solubility in water? in each case we see that for every 1 mole of molecule that dissolves, 1 mole of cation is released,
http://answers.yahoo.com/question/index?qid=20081005120217AAZ99YmHOME |
the dissociation occurs as follows:
K2SO4->2K+ + SO4(2-)
ie. for every mole of K2SO4 you produce 2 moles of K+ (a cation).
Hence, if you start with 1.45 mol of K2SO4 then you will get 2.9 mol
of cations.
This is a result of the equation needing to be balanced. As you have 2
potassium atoms on the left then you need to have 2 on the right.
Also, charge must be balanced so as the SO4 provides 2 negative
charges the potassiums must provide 2 positive charges. The two
options here are as shown or K2 (2+). You know the 1st is formed
because potassium is in group one so it wants to lose one electron to
get to a Noble gas electronic configuartion and the formation of K2
(2+) is less favourable than forming 2K+.
Hope this helps. General Chemistry Online: Companion Notes: Compounds: Classifying ::
The mole. Gases. Energy & change. The quantum theory strong attractions between anions and cations. strong repulsions between ions of like charge
http://antoine.frostburg.edu/chem/senese/101/compounds/ionicvscovalent.shtmlHOME |
General Chemistry Online: FAQ: Energy and chemical change: What are ::
What are some examples of exothermic and endothermic processes? forming a cation from an atom in the gas phase. mixing sodium sulfite and bleach. baking bread
http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtmlHOME |
% of water in a crystalline hydrate::
Determine the ratio of moles of water to moles of CuSO4. Show calculations. 2. What type of bonding is used between the Cu2+ cation and the SO42- anion, in
http://www.chem.iastate.edu/group/Greenbowe/sections/projectfoldericalformulatutorials.htmHOME |
One approach is to look at what items are mentioned and what you know
(or can look up) about them:
* cation
A cation is a positive ion. (If you couldn't remember this, the index
in your book would probably lead you to its definition.)
* ionic compound
A compound made of a metal(s) and a non-metal(s) is likely to be made
of ions (cations and anions).
* K2SO4
K is potassium, a metal in Group I; S is sulfur, a non-metal; and O is
oxygen, also a non-metal. (The non-metals are often combined in one
unit, the sulfate ion in this case.)
* metals and cations
Metals tend to lose electrons; in the process, they become positive
ions, or cations.
* cations in K2SO4
From the formula, you see that there are two potassiums, or two
cations. You should be able to finish the problem now.
Other information: Although not strictly necessary here, you should be
able to figure out that K has one positive charge since it is in group
I (and so has one electron that can be removed fairly readily). With
two K+ ions, the sulfate ion must have two negative charges, SO4-2.
(You could also get the charges by a google search using "cation ion K
SO4.")
thanx
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