The NFPA health rating for pure sodium thiosulfate is 1. Why is the NFPA health

Question

The NFPA health rating for pure sodium thiosulfate is 1. Why is the NFPA health rating for the sodium thiosulfate + NaOH solution 3?

1. It is prepared in a solution containing ethyl alcohol

2. The compound becomes more toxic when dissolved in water

3. It is prepared in a solution containing sodium hydroxide

4. The compound decomposes when exposed to light, making it more toxic

1. It is prepared in a solution containing ethyl alcohol

2. The compound becomes more toxic when dissolved in water

3. It is prepared in a solution containing sodium hydroxide

4. The compound decomposes when exposed to light, making it more toxic

Explanation / Answer

It is because sodium thiosulfate +NaOH are easily capable of explosive decomposition when exposed to light or react with water. Thus, making it more toxic. Therefore health rating is 3 according to NFPA.

So, option (2) and (4) both are correct choices.

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