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 AlCl3, Na2CO3, C2H7NO2 give an explanation of these salts should have these Ph with an equation to show Hydrolysis????
Na2CO3. The CO3^-2 ion hydrolyzes as follows:
CO3^-2 + HOH ==> HCO3^- + OH^-
Thus you see OH^- is produced; the pH should be basic. By the way, it is pH and not Ph.
To explain why each of these salts have the given pH and how hydrolysis occurs, we need to look at the nature of the ions and their interactions with water molecules.
a) AlCl3 (Aluminum Chloride):
Aluminum chloride is a salt that dissociates into aluminum ions (Al3+) and chloride ions (Cl-) in water. The presence of the Al3+ ion makes the solution acidic because aluminum can react with water to form aluminum hydroxide and hydronium ions. This reaction is known as hydrolysis and can be represented by the equation:
Al3+ + 3H2O ↔ Al(OH)3 + 3H+
The formation of hydronium ions (H+) from the reaction with water molecules results in the solution having a pH of 4.0, which is acidic. The universal indicator color of red indicates an acidic pH.
b) Na2CO3 (Sodium Carbonate):
Sodium carbonate is a salt that dissociates into sodium ions (Na+) and carbonate ions (CO3^2-) in water. The presence of the CO3^2- ion makes the solution basic (alkaline) because carbonate ions can react with water to form bicarbonate ions (HCO3-) and hydroxide ions (OH-). This reaction is also known as hydrolysis and can be represented by the equation:
CO3^2- + H2O ↔ HCO3- + OH-
The formation of hydroxide ions (OH-) from the reaction with water molecules results in the solution having a pH of 9.5, which is alkaline. The universal indicator color of violet indicates a basic pH.
c) C2H7NO2 (Ammonium Acetate):
Ammonium acetate is a salt that dissociates into ammonium ions (NH4+) and acetate ions (CH3COO-) in water. The presence of the NH4+ ion makes the solution slightly acidic because ammonium can react with water to form ammonium ions and hydronium ions. This reaction is once again hydrolysis and can be represented by the equation:
NH4+ + H2O ↔ NH3 + H3O+
The formation of hydronium ions (H3O+) from the reaction with water molecules results in the solution having a pH of 7.5, which is slightly acidic. The universal indicator color of green indicates a slightly acidic pH.
In summary, the pH values and hydrolysis reactions of these salts are determined by the properties of the ions they contain and their interactions with water molecules.