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Chapter 11: Q73E (page 650)

How do colloids differ from solutions with regard to dispersed particle size and homogeneity?

Short Answer

Expert verified

Colloidal dispersions consist of particles much bigger than the solutes of typical solutions. Colloids are homogeneous on a macroscopic (visual) scale, while solutions are homogeneous on a microscopic (molecular) scale.

Step by step solution

01

Definition of Colloidal Particles

Colloids (also known as colloidal solutions or colloidal systems) are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance.

02

Definition of Solutions

A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.

03

Difference in size

The size of the suspended particles in a colloid can range from 1 to 1000 nanometres (10-9 meters). Colloidal particles are either very large molecules or aggregates of smaller species that usually are big enough to scatter light.

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Most popular questions from this chapter

What is the microscopic explanation for the macroscopic behaviour illustrated in the figure?

Calculate the mole fraction of each solute and solvent:

  1. 583 g of\({{\bf{H}}_2}{\bf{S}}{{\bf{O}}_4}\)in 1.50 kg of water—the acid solution used in an automobile battery
  2. 0.86 g of NaCl in 1.00 × 102 g of water—a solution of sodium chloride for intravenous injection
  3. 46.85 g of codeine, \({{\bf{C}}_{{\bf{18}}}}{{\bf{H}}_{{\bf{21}}}}{\bf{N}}{{\bf{O}}_{\bf{3}}}\), in 125.5 g of ethanol, \({{\bf{C}}_{\bf{2}}}{{\bf{H}}_{\bf{5}}}{\bf{OH}}\)
  4. 25 g of I2 in 125 g of ethanol, \({{\bf{C}}_{\bf{2}}}{{\bf{H}}_{\bf{5}}}{\bf{OH}}\).

A sample of\({\bf{HgCl}}2\)weighing 9.41 g is dissolved in 32.75 g of ethanol,\({\bf{C}}2{\bf{H}}5{\bf{OH}}\)(\({\bf{Kb}}\)= 1.20 °C/m). The boiling point elevation of the solution is 1.27 °C. Is\({\bf{HgC}}{{\bf{l}}_{\bf{2}}}\)an electrolyte in ethanol? Show your calculations.

Calculate the boiling point elevation of 0.100 kg of water containing 0.010 mol of NaCl, 0.020 mol of \({\bf{N}}{{\bf{a}}_2}{\bf{S}}{{\bf{O}}_4}\), and 0.030 mol of \({\bf{MgC}}{{\bf{l}}_2}\), assuming complete dissociation of these electrolytes.

How many litres of HCl gas, measured at 30.0 °C and 745 torr, are required to prepare 1.25 L of a 3.20M solution of hydrochloric acid?
See all solutions

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