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muriatic acid is the commercial name for hydrochloric acid that can be purchased from hardware stores as a solution that is 30%(w/w) HCL. What mass of this solution contains 7.5g of HCL?,

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ChemistryHelper2024
We have 30% (w/w) HCl this means : 
               100 g solution contains 30 g HCl
               ?? g solution contains 7.5 g HCl
By cross multiplication:
Mass of solution = [tex] \frac{100 x 7.5 }{30} [/tex] = 25 g solution

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