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1. A saline solution lowered its concentration from 55% to 10%. We started with 25mL, how...

1. A saline solution lowered its concentration from 55% to 10%. We started with 25mL, how much volume was obtained after diluting it?

2. 800mcL of an ammonia solution was collected to dilute it in 20 mL and have a concentration of 3.7%. What was the concentration of the ammonia solution before diluting it?

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