SALT-Properties-nature

 

SALT:

A salt is an ionic compound formed from the reaction of an acid with a base. This reaction is called a neutralization reaction. A salt consists of the positive ion (cation) from a base and the negative ion (anion) from an acid.

General Properties of Salts:

• Ionic Compounds: Salts are held together by strong electrostatic forces between positively charged cations and negatively charged anions, forming ionic bonds.

• Crystalline Solids: Most salts exist as crystalline solids at room temperature.

• High Melting and Boiling Points: Due to strong ionic bonds, salts generally have high melting and boiling points.

• Solubility: Many salts are soluble in water, where they dissociate into their constituent ions.

• Conductivity: Solid salts are typically electrical insulators. However, when melted or dissolved in water, their ions become mobile, making them excellent conductors of electricity (electrolytes). 

Salt solutions in water can be acidic, basic, or neutral, depending on the strength of the parent acid and base from which they are formed. This property is known as the nature of the salt.

1)Neutral Salts (Strong Acid + Strong Base):Formation: These salts are formed when a strong acid reacts completely with a strong base. 

Sodium Chloride (NaCl): Formed from hydrochloric acid (HCl, a strong acid) and sodium hydroxide (NaOH, a strong base). This is common table salt.

Potassium Nitrate (KNO3): Formed from nitric acid (HNO3, a strong acid) and potassium hydroxide (KOH, a strong base).

Sodium Sulfate (Na2$SO$4): Formed from sulfuric acid (H2SO4, a strong acid) and sodium hydroxide (NaOH, a strong base).

Potassium Chloride (KCl): Formed from hydrochloric acid (HCl, a strong acid) and potassium hydroxide (KOH, a strong base).

 

2)Basic Salts (Weak Acid + Strong Base):Formation: These salts are formed when a weak acid reacts with a strong base.

Sodium Acetate (CH3COONa): Formed from acetic acid (CH3COOH, a weak acid) and sodium hydroxide (NaOH, a strong base).

Sodium Carbonate (Na2$CO$3): Formed from carbonic acid (H2CO3, a weak acid) and sodium hydroxide (NaOH, a strong base). This is also known as washing soda.

Potassium Cyanide (KCN): Formed from hydrocyanic acid (HCN, a weak acid) and potassium hydroxide (KOH, a strong base).

Sodium Bicarbonate (NaHCO3): Formed from carbonic acid (H2CO3, a weak acid) and sodium hydroxide (NaOH, a strong base). This is baking soda, and it can also be considered an "acid salt" in the context of polyprotic acids, but its solution is basic.

3)Acidic Salts (Strong Acid + Weak Base):Formation: These salts are formed when a strong acid reacts with a weak base

Ammonium Chloride (NH4Cl): Formed from hydrochloric acid (HCl, a strong acid) and ammonium hydroxide (NH4OH, a weak base).

Ammonium Sulfate ((NH4)${}_2$SO4): Formed from sulfuric acid (H2SO4, a strong acid) and ammonium hydroxide (NH4OH, a weak base).

Copper(II) Sulfate (CuSO4): Formed from sulfuric acid (H2SO4, a strong acid) and copper(II) hydroxide (Cu(OH)2​, a weak base).

Aluminum Chloride (AlCl3): Formed from hydrochloric acid (HCl, a strong acid) and aluminum hydroxide (Al(OH)3​, a weak base).