WorksheetsSolvent extraction and Ion exchange resin
Total questions: 20
Worksheet time: 10mins
Solvent extraction involves isolating a solute from a solution by extraction using an immiscible solvent in which the solute is soluble.
TRUE
FALSE
Solvent extraction is carried out inside a ____
separating funnel
burette
volumetric flask
round-bottom flask
In solvent extraction, the two solvents are _____ and form ____ layers.
immiscible; two
immiscible; one
soluble; two
soluble; one
In solvent extraction, the solvent should be___. Tick all that apply.
immiscible with the liquid mixture or solution (usually water)
one in which the solute is more soluble in than the liquid mixture or solution (usually water)
volatile to allow the solute to be obtained by the evaporation of the solvent
unreactive with the solute
How to maximise the amount of extracted solute?
Single extraction using a large volume of solvent.
Single extraction using a small volume of solvent.
Repeat extractions
Which plays a deciding role in the choice of solvents in liquid-liquid extraction process?
The dielectric constant D
Partition coefficient K
Both of the above
None of these
From given list which is least polar solvent?
Hexane
Ethyl Acetate
Acetone
Water
Ion-exchange resin is __________
Soluble
Organic polymer with porous structure
Low molecular weight
Linear
Which of the following ion get released from the cation exchange column?
Ca+2
K+
Na+
H+
Which of the following ion get released from the anion exchange column?
SO4-2
Cl–
OH–
CO3-2
Ion-free water coming out from the exchanger is known as ____________
Demineralised water
Potable water
Disinfected water
Coagulated water
The exhausted cation exchange column is regenerated by passing a solution of ____________
Conc. NaCl
Conc. HCl
Dil. HCl
Dil. NaCl
The exhausted anion exchange column is regenerated by passing a solution of ____________
Dil. KOH
Conc. KOH
Conc. NaOH
Dil. NaOH
In ion exchange process, the iron and manganese ions are removed from the water
True
False
2RNa+ + Ca+2
↔..... ..... + 2Na+
(a)
2RNa+ + Mg+2
<--->RMg+2 +
(a)
In an ion exchange process, ions removed from the water are exchanged with ions of _____________ from the resin's surface.
Similar charge (+ ,+)
Opposite charge (+, -)
Disadvantage of Ion exchange process is --
Costly
more residual hardness
Difficult to operate
Turbidity and suspended particles can block the resin pores
What ions cause hardness in water?
(all that apply)
Calcium
Manganese
Sodium
Magnesium
During softener service:
_________ leave resin surface
_________ attach to resin surface
Sodium ions, Hardness ions
Hardness ions, Sodium Ions
Cations, Anions
Hydrogen, All cations
