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Q)Calculate the ionic strength value for half-normal saline, containing sodium chloride
(c(NaCl) = 7.70×10-3 mol/L) and dextrose (c(dextrose) = 0.28 mol/L).
(a) 7.70×10^-3 mol/L
(b) 0.0154 mol/L
(c) 0.1440 mol/L
(d) 0.2877 mol/L
Q)Calculate the boiling point of hypertonic saline with mass fraction of sodium chloride
7.0%. (Kb (H2O) = 0.52 K × kg × mol-1).
(a) 1.35 K
(b) 101.35 C
(c) 0.67 K
(d) 100.67 C
Q)Sodium lauryl sulfate (SLS) is used as a surfactant in many hygiene products, in
particular in toothpastes. Calculate the surface activity of SLS at 20 C if known that surface
tension of its solution with 6.6 mmol×dm-3 concentration value is equal to 47 mN×m-1,
and with 8.3 mmol×dm-3 concentration value is equal to 43 mN×m-1.
(a) 0.43
(b) -0.43
(c) - 2.35
(d) 2.35
Calculate the pH value of acetate buffer (pKa = 4.76) prepared by mixing of 9.0 mL of
sodium acetate solution with 1.0 mL of acetic acid solution (c(CH3COOH) = c(CH3COONa)).
Determine the range of buffer action for the acetate buffer.
(a) 3.81; 3.81(+/-)1
(b) 3.81; 4.76(+/-)1
(c) 5.71; 5.71(+/-)1
(d) 5.71; 4.76(+/-)1
Q)Calculate the ionic strength value for half-normal saline, containing sodium chloride
(c(NaCl) = 7.70×10-3 mol/L) and dextrose (c(dextrose) = 0.28 mol/L).
(a) 7.70×10^-3 mol/L
(b) 0.0154 mol/L
(c) 0.1440 mol/L
(d) 0.2877 mol/L
Q)Calculate the boiling point of hypertonic saline with mass fraction of sodium chloride
7.0%. (Kb (H2O) = 0.52 K × kg × mol-1).
(a) 1.35 K
(b) 101.35 C
(c) 0.67 K
(d) 100.67 C
Q)Sodium lauryl sulfate (SLS) is used as a surfactant in many hygiene products, in
particular in toothpastes. Calculate the surface activity of SLS at 20 C if known that surface
tension of its solution with 6.6 mmol×dm-3 concentration value is equal to 47 mN×m-1,
and with 8.3 mmol×dm-3 concentration value is equal to 43 mN×m-1.
(a) 0.43
(b) -0.43
(c) - 2.35
(d) 2.35
Calculate the pH value of acetate buffer (pKa = 4.76) prepared by mixing of 9.0 mL of
sodium acetate solution with 1.0 mL of acetic acid solution (c(CH3COOH) = c(CH3COONa)).
Determine the range of buffer action for the acetate buffer.
(a) 3.81; 3.81(+/-)1
(b) 3.81; 4.76(+/-)1
(c) 5.71; 5.71(+/-)1
(d) 5.71; 4.76(+/-)1
For the reaction of crystal violet with NaOH(aq), the measured rate of reaction is 1.27 x 10-6 mol L-1 s-1 when the concentration of crystal violet cation is 4.13 x 10-5 mol/L. Estimate how long it will take for the concentration of crystal violet to drop from 4.30 x 10-5 mol/L to 3.96 x 10-5 mol/L.
A conductivity cell having a cell constant of 0.5 cm–1 filled with 0.02 M solution of KCl at
298 K gave a resistance of 20.2 Ω. The water used for preparing the solution had a conductivity
of 7.1 × 10–6 S cm–1. Calculate the molar conductivity of 0.02 M KCl solution.
CuSO4 + KOH --> Cu(OH)2 + K2SO4
How many liters of 0.2M CuSO4 is required to react with 450 ml 0.6M KOH?
How many milliliters of 0.25M K2SO4 are needed to provide 28g K?
H2S + NaOH --> Na2S + H2O
If 350ml 0.6M H2S is reacted how many grams of Na2S will be made?
How many grams of pb can be extracted from 380 ml 0.4M pb(no3)3?
Write out and balance the precipitation reaction between CuCl2 and Na3PO4
A conductivity cell having a cell constant of 0.5 cm–1 filled with 0.02 M solution of KCl at
298 K gave a resistance of 20.2 Ω. The water used for preparing the solution had a conductivity
of 7.1 × 10–6 S cm–1. Calculate the molar conductivity of 0.02 M KCl solution.
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