Hydrolysis of Salt:
Using the universal indicator we had to determine the pH of potassium chloride, and the results i got was pH- 7.5 .
Now i have to explain this with a equation to show hydrolysis.
I dunno how to write it out, but i think KCL should be neutral.
Yes, it should be neutral.
KCl(aq) ==> K^+ + Cl^-
K^+ + HOH ==> No reaction (no hydrolysis).
Cl^- + H2O ==> no reaction (no hydrolysis); that is, H2O is a stronger base than Cl^-(H2O pulls its proton more than Cl^-).
To understand the hydrolysis of potassium chloride (KCl), we need to know that hydrolysis is a chemical reaction where water molecules react with the ions of a salt.
In the case of KCl, this salt is formed by the combination of potassium ions (K+) and chloride ions (Cl-) in a 1:1 ratio. When KCl is dissolved in water, the positive potassium ions (K+) and negative chloride ions (Cl-) separate and become surrounded by water molecules.
The hydrolysis reaction of KCl can be represented by the following equation:
KCl + H2O → K+ + Cl- + H2O
In this reaction, water molecules (H2O) interact with the potassium ions (K+) and chloride ions (Cl-) creating hydrated ions (K+ and Cl-) and hydronium ions (H3O+). The hydronium ions increase the concentration of H+ ions, resulting in a decrease in pH.
However, in the case of KCl, the hydrolysis reaction is weak because the ions formed (K+ and Cl-) are derived from strong acids (HCl) and a strong base (KOH), respectively. Since the ions are fully dissociated in water, they do not significantly react with water to produce H+ or OH- ions.
Therefore, when KCl is dissolved in water, it does not undergo significant hydrolysis, and the resulting solution remains close to neutral (pH 7) - slightly lower or higher, depending on other factors like impurities in the water or the specific universal indicator used.
In your case, obtaining a pH value of 7.5 for the KCl solution indicates that it is slightly basic, possibly due to the presence of impurities or other factors influencing the pH measurement. However, the actual hydrolysis of KCl is negligible.