Question

How do you determine the number of ions per formula unit?

Answer #1

Now, in every formula unit there are 6.022 X 10^23 ions (avogadro's
number). In the case of CO2, there are 3 ions in each formula unt.
So for carbon dioxide, you add up the total number of ions present
(3--1 carbon plus 2 oxygen) and multiply 3 by 6.022 x 10^23 to find
out the number of ions in a formula unit.

CO2 = 1.8 X 10^23 ions

H3PO4 = 4.8 X 10^24 ions

AL(OH)3 = 4.2 X 10^24 ions

KNO2 = 2.4 X 10^24 ions

Al(OH)CL2 = 3.01 X 10^24 ions

How do we know how many ions there are per lattice point in a
unit cell?

How do you tell how many ions are in the unit cell of BaO?

edited: how do you determine the number of waters of
crystallization in the formula by titrating a sample of sodium
carbonate? I'm not sure how to set up this procedure or the numbers
to use...using .1M HCl Volume of analyze used?
*Titrant = HCl, estimated endpoint volume of the titration (.1 M
HCl) i'm confused on how you find these parts in order to write the
procedure?

The unit-cell of the compound
KxMgyFz is cubic, with
Mg2+ at the corners of the cube, F- ions in
the 12 edge sites, and the K+ in the center of the
cube.
(a) Determine the number of magnesium ions per unit cell
(b) Determine the number of fluoride ions per unit cell
(c) Determine the number of potassium ions per unit cell
(d) Determine the coordination number for the magnesium and the
potassium ions
(e) Determine the formula for
KxMgyFz

How do you determine an atom or ions expected size? I've tried
following the rules for atomic radius, but it is not working.
please help!

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how do you get the basic formula for calculations for
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how is it calculated?

Determine the empirical formula of the compound with a crystal
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class is MR = chg in TR/chg in Q

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