Lab safety and apparatusBasic

• A.A little concentrated sulfuric acid on the skin: rinse at once with plenty of water, then apply $3\%\sim 5\%$ $\mathrm{NaHCO_3}$ solution
• B.An alcohol lamp is knocked over and the spilled alcohol burns on the bench: pour water on it at once
• C.$\mathrm{NaOH}$ solution splashes into the eyes: rinse at once with dilute hydrochloric acid
• D.Sodium metal catches fire: put it out at once with a foam extinguisher

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