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How would you prepare 1.00 L of a 0.50 M solution of each of the following,
a) H2SO4 from concentrated (18 M) sulfuric acid
b) HCl from concentrated 12 M reagent
c) NiCl2 from salt NiCl2.6H2O
d) HNO3 from concentrated 16 M reagent
e) Sodium carbonate from pure solid
What percentage of water vapor is found in the air?