meant by this. In addition, what is the remaining 97%?
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OK--what 3% means is that in every 100 gm of solution, 3% of that--or 3 gms--is pure hydrogen peroxide. The remainder, as noted by others, is water (the 97%).
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The remaining 97% is almost all water plus a small amount of stabiliser (often phenacetin)
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What part of 3% of the solution is hydrogen peroxide do you not get? The remaining 97% is water.
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Water