PIMSO 2023 - Science - Secondary 1 - National Round Question 12

You are helping your parents to cook sinigang, a popular Filipino dish composed of meat and vegetables in a clear sour broth: They asked you to boil some water to make soup and notify them as soon as the water starts to boil at 100 °C. You told them that it started to boil after ten minutes, but they are not yet ready preparing the meat and vegetables. So to conserve energy, they asked you to lower the heat. You lowered the heat just enough so that some bubbles still appear to rise to the top of the water, although it is not boiling vigorously anymore. What is the temperature of the water at this point?



Editorial assumption: Assume the liquid remains at boiling equilibrium at the same atmospheric pressure.