When ammonium chloride (NH4Cl) dissolves in water, it undergoes an endothermic reaction. This means that it absorbs heat from the surrounding water. As a result, the temperature of the surrounding water decreases.
The extent of the temperature change can vary depending on the concentration of the ammonium chloride and the amount of water used, but it generally can cause a temperature drop of a few degrees Celsius. In typical laboratory conditions, the decrease can be around 5 to 10 degrees Celsius, but this can vary.
So the complete statement could read: "When ammonium chloride reacts with water, the chemical reaction makes the surrounding water cooler by approximately 5 to 10 degrees Celsius."
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