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9/100 = 12 / (100 +x) so 0.09 (100+x) = 12 so 9 +0.09x =12

therefore 0.09x = 12-9 and thus x = 3/0.09 = 33.334

So to 100g of 12% peroxide would need to add 33.34 g water.

To put another way to every 3 parts peroxide add 1 part water.

Ratio of 3:1 peroxide:water

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10y ago
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Q: How do you dilute 12 percent peroxide to 9 percent?
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