The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

Analysis

This question tests your knowledge of laboratory safety protocols, specifically regarding the handling of chemical burns caused by strong acids like concentrated tetraoxosulphate(VI) acid ($H_2SO_4$).

Concept

Concentrated tetraoxosulphate(VI) acid is a powerful dehydrating agent and a strong corrosive acid. When it comes into contact with the skin, it reacts exothermically (releasing a large amount of heat), which can cause severe thermal and chemical burns.

The primary goal in treating an acid spill on the skin is to dilute and remove the acid as quickly as possible. While it might seem logical to use a base (like sodium hydroxide) to "neutralize" the acid, this is highly dangerous. The reaction between a strong acid and a strong base is extremely exothermic; the heat generated by the neutralization reaction would cause even more severe burns to the skin.

Step-by-Step Solution

1. Immediate Action: The most effective way to stop the corrosive action of the acid is to flush the affected area with large volumes of cool, running water.
2. Dilution: Water dilutes the acid, lowering its concentration and washing it away from the skin surface.
3. Heat Dissipation: The "running" nature of the water helps to dissipate the heat generated by the initial contact, preventing further tissue damage.
4. Safety Protocol: In any laboratory setting (WASSCE/JAMB/NECO standards), the standard first-aid procedure for acid spills is to wash the area with plenty of water for at least 10–15 minutes before seeking medical attention.

Why other options are incorrect:

• B (Sodium hydroxide): As mentioned, this is a strong base. Mixing it with the acid will cause a violent, heat-releasing reaction that will worsen the burn.
• C (Iodine solution): This is an antiseptic and has no role in neutralizing or removing concentrated acids.
• D (Sodium trioxonitrate(V)): This is a salt solution and does not help in neutralizing or safely removing the acid.

Exam Tip

Always remember the "Water First" rule for chemical spills. Never attempt to neutralize a strong acid or base spill on the skin with another chemical reagent; always use copious amounts of water to dilute and wash the substance away.