Babu took some quantity of dilute nitric acid in a test tube and heated the test tube at 70°C for about 10 minutes. What was its effect on the pH of nitric acid?

When Babu heated dilute nitric acid at 70°C for about 10 minutes, the pH of nitric acid decreased. As temperature increases, the decomposition of acid increases, leading to more dissociation of hydrogen ions (H+), which lowers the pH, making the solution more acidic.