In nature, the ordered plan of ionic solids provides rise to beautiful crystals. (A) Amethyst – a kind of quartz, SiO 2 , who purple shade comes native iron ions. (B) Cinnabar – the main ore that mercury is mercury(II) sulfide, HgS. (C) Azurite – a copper mineral, Cu 3 (CO 3 ) 2 (OH) 2 . D) Vanadinite – the main ore that vanadium, Pb 5 (VO 4 ) 3 Cl.

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What produces colored crystals?

The figure above shows just a couple of examples the the color and brilliance that naturally developing ionic crystals. The regular and also orderly arrangement of ion in the decision lattice is responsible for the various shapes of this crystals, while change metal ions provide rise come the colors.

Physical properties of Ionic Compounds

Melting Points

Because that the countless simultaneous attractions in between cations and anions that occur, ionic decision lattices are very strong. The process of melting an ionic compound calls for the addition of huge amounts of power in order to break every one of the ionic bonds in the crystal. Because that example, sodium chloride has a melting temperature of about 800°C.


Ionic compounds are generally hard, but brittle. Why? the takes a big amount of mechanically force, such as striking a crystal v a hammer, to force one great of ions to shift relative to its neighbor. However, once that happens, it brings ion of the exact same charge beside each other (see Figure below ). The repulsive forces between like-charged ions cause the crystal to shatter. When an ionic crystal breaks, it often tends to do so along smooth planes because of the regular arrangement of the ions.

Figure 8.13

(A) The sodium chloride decision is presented in two dimensions. (B) once struck by a hammer, the negatively-charged chloride ions are required near every other and also the repulsive force reasons the decision to shatter.


Another characteristic residential or commercial property of ionic compounds is their electrical conductivity. The figure listed below shows 3 experiments in which two electrodes the are linked to a light pear are inserted in beakers comprise three different substances.

Figure 8.14

(A) Distilled water does not conduct electricity. (B) A solid ionic compound likewise does not conduct. (C) A water solution of one ionic compound conducts electricity well.

In the an initial beaker, distilled water does no conduct a current since water is a molecular compound. In the 2nd beaker, solid salt chloride additionally does no conduct a current. Despite being ionic and thus written of charges particles, the solid crystal lattice does not enable the ions to move in between the electrodes. Mobile fee particles are compelled for the circuit to it is in complete and the light pear to light up. In the 3rd beaker, the NaCl has been dissolved into the distilled water. Now the crystal lattice has actually been broken apart and also the individual hopeful and an adverse ions deserve to move. Cations move to one electrode, while anions relocate to the other, permitting electricity to circulation (see Figure below ). Melting an ionic compound also frees the ions to command a current. Ionic compounds command an electric existing when melted or dissolved in water.

Figure 8.15

In one ionic solution, the A + ions migrate toward the an adverse electrode, while the B − ions migrate toward the positive electrode.

SummaryIonic compounds have high melt points.Ionic compounds room hard and also brittle.Solutions that ionic compounds and also melted ionic compounds command electricity, yet solid products do not.Practice


Watch the video at the link below and answer the complying with questions:

Do all ionic compounds kind crystals?Will melted ionic compounds command electricity?What room the melting and boiling points of KI?Review


Why are ionic compounds brittle?Why space melting clues high because that ionic compounds?What happens once an electric present is passed with a solution of an ionic compound?
brittle: Easily broken, cracked, or snapped.electrical conductivity: The capacity to conduct an electric current.

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