Inorganic Chemistry Answers

1. What volume of 68% HNO3 would you need to make up 425 mL of 0.150M HNO3? The density of 68% HNO3 is 1.41 g/mL


2. An experiment requires 0.949g of H2SO4. What volume (in mL) of 0.215M H2SO4 must be used ?

1.Show using calculations if a CaF2 precipitate will form when 25 ml of 0.02M, NaF is mixed with 10ml of 0.01M Ca(NO3)2? Ksp CaF2=3.9×10^-11


2.Write balanced equation including phase labels for the following;
a) Lead metal is produced by heating solid lead sulphide with solid lead sulphate, resulting in liquid lead and sulphur dioxide gas.

b) Lime, CaO, is converted to slaked lime , CA(OH)2 by reaction with water.

c) Aluminium metal is produced from aluminium oxide by an alectrolytic process. Oxygen is also a product.

If all the water were allowed to evaporate from 12 mL of a 0.64 mol/L solution of potassium iodide, KI, what mass of solute would remain?

Question 10 options:

106.24 g


1.99 g


12.75 g


1.27 g

1. Balance the following Redox reactions all occurring in basic medium
Fe(OH)3(s) + Cr(s) = Cr(OH)3(s) + Fe(OH)2(s)

2. Calculate the solubility of BaSO4 in pure water in g/L. Ksp BaSO4= 1.1×10^-10

3.The solubility product of Fe(OH)2 is 8×10^-16. Calculate the solubility of Fe(OH)2 in
(a) moles/l
(b)g/l

Air is a mixture of gases. 900 cm^3 of a sample of dry air at room temperature and pressure was passed over 0.5 g of heated copper turnings in a hard glass tube and, a solid A was formed and the resulting gas B was bubbled into sodium hydroxide solution.
a) What component of the air sample was absent in B? Calculate its volume in the air sample.
b) Determine the empirical formula of the solid A.
c) Write a chemical equation to show the component of the air sample removed during bubbling into the solution of sodium hydroxide.
d) Name the main component of the air remaining after the component in (c) above was removed.
State its percentage composition by volume in air
f) Write a balanced chemical equation for the laboratory preparation of the component in (c) above.

Draw structure of the pentapeptide Arg -Ser- Ala -Asp - Gly at PH 7.

What volume of oxygen, measured under room conditions, can be obtained from the thermal decomposition of 8.2g of calcium nitrate?
A- 600cm^3
B-1200cm^3
C-150cm^3
D-300cm^3
The solution needed with an explanation.
Thanks

If a nitric acid solution has a pH of 5, how does this acid concentration compare to the H+ contribution
of pure H2O, i.o.w. how many times bigger or smaller is it? Show calculations, concluding with a
proper sentence statement.