What quantity (in mL ) of a 45 % acid solution of a mono-protic strong acid must be mixed with a 20 % solution of the same acid to produce 800 mL of a 29 . 875 % acid solution?

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V × 45 100 + 800 - V 20 100 = 800 × 29 .875 100 9 V 20 + 160 - V 5 = 239 5 V 20 = 79 ⇒ V = 316

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