For what's worth:

The pH of potassium chloride (KCl) in water is not a straightforward answer, as it depends on the concentration of the KCl solution. In general, KCl is considered a neutral salt, as it is formed from the reaction of a strong acid (HCl) and a strong base (KOH). However, the pH of KCl solutions can still vary based on the concentration of the solution.

In general, the pH of a KCl solution will depend on the concentration of the solution and the pH of the water it is dissolved in. At low concentrations, the pH of a KCl solution is likely to be close to neutral (pH 7), while at higher concentrations, the pH may be slightly acidic or basic due to the presence of the KCl ions.

When it comes to contaminants and chemicals present in KCl solutions, it is important to consider the source of the KCl and the conditions under which it was prepared. KCl is commonly used in laboratory settings as a standard for calibration and as a salt bridge in electrochemical cells. In these applications, KCl is typically highly purified and free from contaminants. However, in other settings, such as in agricultural or industrial applications, KCl may contain impurities or contaminants that can affect the pH and other properties of the solution.