Answer:
85.5%
Explanation:
To get the experimental value, you need to convert 15.0 grams of Na2SO4 to grams of Na3PO4. You do this with stoichiometry.
Convert grams of Na2SO4 to moles with molar mass. Then convert to moles of Na3PO4 with the mole-to-mole ratio according to the balanced chemical equation. Then convert moles of Na3PO4 to grams with the molar mass.
15.0 g Na2SO4 x (1 mol/142.04 g) x (2 Na3PO4/3Na2SO4) x (163.94 g/1 mol) = 11.7 g Na3PO4
Percent Yield = (actual value/experimental value) x 100
Actual Value = 10.0 g
Experimental Value = 11.7 g
10.0g/11.7 g = 85.5%
The solution is buffered with a weak acid and it's conjugate base. Since NaOH is a base, you can use a weak acid as it's buffer.
The correct answer is a suspension.
A suspension is a mixture containing relatively large particles that settle fast
A homogenous mixture is a mixture where everything looks the same throughout and is all in the same phases
A colloid is a heterogenous mixture where the particles are small enough to stay suspended (usually talking about gaseous solutions)
And a solution is a homogenous mixture where the particles are too small to even reflect light
Answer:
(a) Tetrahedral;
(b) Bent
Explanation:
(a) I assume you meant either 
or 
. In both cases, we expect to have the same shape, however.
In phosphoric acid, the central atom, phosphorus, has a total of three single P-O bonds and one double P=O bond. No lone pairs are present. According to the VSEPR theory, the steric number is the sum of the bonds (ignoring multiplicity) and the lone pairs present on the central atom. For a total of 4 bonds and no lone pairs, the steric number of P is 4. This corresponds to a tetrahedral shape both electronically and geometrically. We don't expect any significant deviation, as no lone pairs are present on P, so we would have an angle of about 
.
(b) In the given ether, oxygen has two bonds. This leaves 2 lone pairs, so that we have an octet on oxygen. Similarly to (a), the steric number is 4. However, we have two lone pairs. This means we don't have a tetrahedral shape anymore, the molecule is bent with an angle of about 
. The angle is significantly reduced compared to the tetrahedal arrangement due to the presence of lone pairs that repel stronger than the shared electrons.
