NUMERICAL PROBLEMS T0g of sodium hydroxide was dissolved in water to give a solution. with a volume o exactly 0.2 dm3. What is the molarity of the solution? 1. (Ans. 1.25 M
NUMERICAL PROBLEMS T0g of sodium hydroxide was dissolved in water to give a solution. with a volume o exactly 0.2 dm3. What is the molarity of the solution? 1. (Ans. 1.25 M
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NUMERICAL PROBLEMS
10g of sodium hydroxide was dissolved in water to give a solution. with a volume o
exactly 0.2 dm3. What is the molarity of the solution?
A solution contains 29.0g of trichloroacetic acid (ClgC COOH) (formula wt 163) ir
1dm3 of an aqueous solution. Assuming that the acid is 72% ionized. Calculate the
formal and molar concentrations of the constituents.
1.
(Ans. 1.25 M
2.
(Ans. Formality = 0.178 F, molarity = 0.04984M
Мн- МСHgCOо-- 0.12816 mol dm
3. 7.03g of a dibasic acid of molar mass 98 are dissolved in 0.8 lit. (0.8dm3) of the
solution. Calculate the molarity and normality of the acid solution.
(Ans. 0.1793 M, 0.08977 M)
39
Chmical Calculations
4. Calculate the equivalent weights of the following substances
a) (HgCgO4, 2H2O) in its reaction with NaOH.
b) (HgCgO4, 2HgO) in its reaction with KMNO4
c) KMNO4 (in acidic medium)
d) AgNOs (in its reaction with NaCI)
5. Calculate the volume of 94% H2SO, solution of density 1.831 g/ml required to
prepare 20 lit. (20 dm) of a 0.1 M solution.
6. Density of H2SO, in an almost completely charged storage battery is 1.25 g/ml. This
solution contains 33.3% by wt of the acid. Calculate
a) wt. of H3SO4 per lit (dm) of the solution
(Ans. (a) 63, (b) 63, (c) 31.6) (d) 170)
(Ans. 113.8 mL)
b) molarity of the solution
c) molality of the solution
7. 23.253 g of potassium nitrate (molar mass 101.1) are dissolved in 150 g of water.
Calculate the mol. fraction of the two components.
8. 100 ml. of an aq. LiCI solution contains 0.637 g of LICI (molar mass 42.44) The density
of the solution is 1.003 g/mL. Express the concentration in terms of normality,
molarity, and mole fraction of the two components.
(Ans. 416 gm, 4.24 M, 5.09 M)
(Ans. 0.027, 0.973)
(Ans. 0.1501 N, 0.1501 M, Xug - 0.0027, XH.O = 0.9973)
9. Calculate the mol fraction of alcohol in 25% aq. solution. The density of the solution is
1.10 g/ml.
(Ans. 0.103)
10. How much of KCl should be weighed to prepare 2.0L of 20 ppm K standard?
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