A researcher mixed 5 cm3 of a 2% urea solution with 2 cm3 of active urease solution in a reaction vial. The initial pH of the mixture was adjusted to pH 6.2. The vial was incubated in a water bath maintained at 30 ∘C30\text{ }^\circ\text{C}30 ∘C for 10 minutes. During this incubation, the pH of the mixture increased from pH 6.2 to pH 8.4.
Explain what caused this increase in pH.
