) Aluminum Chloride has a universal indicator color of red and the Ph of 4.0
b) Sodium Carbonate has a universal indicator color of violet and the Ph of 9.5.
c) Ammonium Acetate has a universal indicator color of green and the Ph of 7.5
For the following salts give an explanation of these salts should have these Ph with an equation to show Hydrolysis????
To understand why certain salts have specific pH values and the occurrence of hydrolysis, we need to analyze the chemical properties of their constituent ions.
a) Aluminum Chloride (AlCl3):
The presence of Aluminum Chloride in water leads to the hydrolysis reaction:
AlCl3 + 3H2O ⇌ Al(OH)3 + 3HCl
The hydrolysis of Aluminum Chloride results in the formation of Aluminum hydroxide (Al(OH)3) and Hydrochloric acid (HCl). The formation of Hydrochloric acid contributes to the acidic nature of the solution, which is reflected by the red color of the universal indicator. The equation above represents the occurrence of hydrolysis for Aluminum Chloride.
b) Sodium Carbonate (Na2CO3):
Sodium Carbonate, in aqueous solution, undergoes hydrolysis as follows:
Na2CO3 + 2H2O ⇌ 2NaOH + H2CO3
The hydrolysis of Sodium Carbonate results in the formation of Sodium hydroxide (NaOH) and Carbonic acid (H2CO3). The presence of the strong base Sodium hydroxide gives the solution an alkaline pH, which is indicated by the violet color of the universal indicator. The hydrolysis equation provided explains the alkaline pH observed in the case of Sodium Carbonate.
c) Ammonium Acetate (NH4CH3COO):
Ammonium Acetate reacts with water to produce hydrolysis:
NH4CH3COO + H2O ⇌ NH4OH + CH3COOH
The hydrolysis of Ammonium Acetate leads to the production of Ammonium hydroxide (NH4OH) and Acetic acid (CH3COOH). The presence of Ammonium hydroxide, a weak base, contributes to a slightly basic pH condition, hence the green color of the universal indicator. The provided equation represents the hydrolysis reaction for Ammonium Acetate.
It's important to note that the pH of a solution is influenced by the equilibrium concentrations of the resulting acids and bases from hydrolysis reactions. The specific pH values mentioned for each salt are approximate values and may vary depending on factors like concentration and temperature.