Final answer:
The correct safe practice when working with chemicals in a laboratory setting is wearing safety goggles to protect your eyes. It is vital to adopt several safety measures including proper waste disposal, turning off Bunsen burners, adding acid to water, checking safety data sheets, and carefully smelling chemicals. So, the correct option is C.
Step-by-step explanation:
Among the practices listed for working with chemicals in a laboratory investigation, wearing safety goggles is the safe practice. This is because safety goggles protect your eyes from harmful splashes, vapors, and debris that may occur while working with chemicals.
Here are crucial safety practices:
- In case of accidents or chemical spills, always call your teacher at once.
- Dispose of waste properly by checking with your teacher, as chemicals should not be disposed of down the sink.
- When using Bunsen burners, ensure all burners are turned off at the end of the practical and all chemical containers are sealed.
- Never add water to acid; instead, always add acid to water to prevent splashing and reactions that could cause harm.
- Review safety data sheets for any chemical you are going to use to understand how to work with it safely.
- When smelling chemicals, do not inhale directly; instead, waft the vapors towards you gently with your hand.