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STOICHIOMETRY - 1
30.
A 6.90 M solution of KOH in water contains 30%
by mass of KOH. What is density of solution in
gm/ml.
Sol.
Page # 141
34. (a) Find molarity of Ca2+ and NO 3– in 2 M Ca(NO 3)2
aqueous solution of density 1.328 g/mL.
(b) Also find mole fraction of solvent in solution.
Sol.
35.
31.
A solution of specific gravity 1.6 is 67% by
weight. What will be % by weight of the solution
of same acid if it is diluted to specific gravity
1.2 ?
Calculate molality (m) of each ion present in the
aqueous solution of 2M NH 4 Cl assuming 100%
dissociation according to reaction.
NH4 Cl (aq )
NH 4 (aq)
Cl (aq )
Given : Density of solution = 3.107 gm/ml.
Sol.
Sol.
36.
32. Find out the volume of 98% w/w H2SO 4 (density =
1.8 gm/ml) must be diluted to prepare 12.5 litres
of 2.5 M sulphuric acid solution.
Sol.
500 ml of 2 M NaCl solution was mixed with 200
ml of 2 M NaCl solution. Calculate the final volume
and molarity of NaCl in final solution if final
solution has density 1.5 gm/ml.
Sol.
EXPERIMENTAL METHODS
33.
Determine the volume of diluted nitric acid (d =
1.11 gmL–1 , 19% w/v HNO3) That can be prepared
by diluting with water 50 mL of conc. HNO3 (d =
1.42 g ML–1, 69.8 % w/v).
37.
Sol.
What is the percentage of nitrogen in an organic
compound 0.14 gm of which gave by Dumas
method 82.1 c.c. of nitrogen collected over water
at 27ºC and at a barometric pressure of 774.5
mm ? (aqueous tension of water at 27ºC is 14.5
mm)
Sol.
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