Discussion
Consider the following statements about quoting bleach concentrations.
1. A recipe may be written on the commercial product or on pure peroxide.
2. The two figures differ by roughly a factor of three for 35 per cent material.
3. The distinction rarely matters in practice.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a recipe may be written on the commercial 35 per cent solution or on 100 per cent peroxide, and the two differ by a factor of about \( 1/0.35 = 2.9 \). Statement 3 is exactly wrong - the distinction matters greatly, since confusing the two bases means dosing at roughly a third or three times the intended strength, which either fails to bleach or damages the fabric.
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