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how to dilute

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c1 * v1 = c2 * v2

for example..u have concentration 70% (0,7 = c1 ) of acid, an lets say u take 5 ml (v1) of it. U want to dilute it to 25% (0,25 = c2). U must now transform the formula so that u can calculate v2 (water). v2 = (c1*v1)/c2.... in this example the answer would be; v2= (0,7*5)/0,25 = 14 ml of water to dilute 70% acid to 25 % acid.

..some reservation for my bad english mathimatical language.

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