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The threshold odour number (TON) for a water sample of 40 ml, dilute to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, is
  • a)
    8
  • b)
    5
  • c)
    50
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The threshold odour number (TON) for a water sample of 40 ml, dilute t...
Threshold odour number represent the dilution ratio at which the odour is hardly detectable.
T.O.N. = 200/40 = 5
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Community Answer
The threshold odour number (TON) for a water sample of 40 ml, dilute t...
Explanation:
The threshold odour number (TON) is a measure of the concentration of an odorant in a water sample. It is defined as the dilution ratio at which the odor becomes just barely detectable to the sense of smell. In this case, we have a water sample of 40 ml that needs to be diluted to a standard 200 ml mixture.

Step 1: Determine the dilution ratio
The dilution ratio is the ratio of the volume of the original sample to the volume of the diluted mixture. In this case, the dilution ratio can be calculated as follows:

Dilution ratio = Volume of original sample / Volume of diluted mixture

Dilution ratio = 40 ml / 200 ml = 1/5

Step 2: Calculate the TON
The TON is equal to the reciprocal of the dilution ratio. In this case, the TON can be calculated as follows:

TON = 1 / Dilution ratio

TON = 1 / (1/5) = 5

Therefore, the TON for the water sample is 5.

Conclusion:
The correct answer is option B) 5. The TON for the water sample, diluted to a standard 200 ml mixture, is 5.
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The threshold odour number (TON) for a water sample of 40 ml, dilute to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, isa)8b)5c)50d)None of theseCorrect answer is option 'B'. Can you explain this answer?
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