The first aid used for acid burn in a laboratory is:ASodium carbonateBSodium bicarbonateCSodium hydroxideDSodium oxideAnswer: B. Sodium bicarbonate Read Explanation: For acid burns in a laboratory setting, the recommended first aid is to:Flush the affected area with plenty of water for at least 15-20 minutes.Neutralize the acid with sodium bicarbonate (baking soda) solution or other neutralizing agents, if available.Sodium bicarbonate helps neutralize the acid and reduce the severity of the burn. Read more in App