How are solutions heated in a 3-ml test tube?

Solutions in a 3-ml test tube are typically heated using a Bunsen burner, hot plate, or water bath. When using a Bunsen burner, the test tube should be held at an angle to allow even heating and prevent breakage. A water bath provides a more controlled and uniform heating environment, reducing the risk of overheating the solution. Always use appropriate safety equipment, such as goggles and gloves, when handling heated materials.