Question

When heating a solution to boiling on a hot plate, start by ________. Then, turn the heat to ________ to start. If necessary, ________ after waiting about ten minutes without seeing boiling.

Answer 1

To boil a solution on a hot plate, start with a medium setting, then switch to high if necessary after ten minutes. Covering the pot with a lid can speed up the process, as can the rate of energy transfer, like heating with 1,000 W.

Step-by-step explanation:

When heating a solution to boiling on a hot plate, start by turning the hot plate to a medium setting. Then, observe the solution: if it's not boiling after about ten minutes, you can turn the hot plate on high. Controlling the temperature is important to reach the boiling point effectively.

Some aspects to consider when boiling water include:

1. Heat ice from -15 °C to 0 °C before melting it.
2. Melt the ice to transition from solid to liquid.
3. Heat water from 0 °C to 100 °C, which is the boiling point at standard atmospheric pressure.
4. Continued heating will boil water; the temperature will stay at 100 °C as it changes from liquid to gas.
5. After water has evaporated, you can heat steam from 100 °C to a higher temperature such as 120 °C.

To expedite the boiling process, one can cover the pot with a lid to trap steam and increase internal pressure, which helps the water reach the boiling point faster. Also, remember that adding heat in the form of calories or joules will influence the rate of temperature increase, depending on the rate of energy transfer, such as 1,000 W.