Aqueous Solutions, page 53 POST-LAB QUESTIONS 1. The label on a reagent bottle c

Question

Aqueous Solutions, page 53 POST-LAB QUESTIONS 1. The label on a reagent bottle containing concentrated hydrochloric acid says that it is (37% HCl by mass, specific gravity-1.19). What volume (in mL) of the reagent would you dispense if you need 0.200 moles of HCI? Hint 1. First calculate mass of HCl needed; then calculate mass of reagent needed knowing that 100 g of reagent contains 37 g of HCl Hint 2. To convert grams of reagent to volume of reagent; you will need to know its density. Specific gravity is the ratio of a sample's density to that of water; since the density of water is 1.00 g/mL, if the specific gravity is 1.19, then the density of the reagent is 1.19 g/mL.

Explanation / Answer

0.2 moles of HCl conatins 0.2 mol * 36.5 g/mol = 7.3 g of HCl

100g of reagent contains 37 g of HCl

37 g of HCl requires 100g of reagent

7.3 g of HCl reagent requires 100/37*7.3 g of reagent

                             = 19.73 g

specific gravity of the reagent = 1.19 g/mL

1.19 g of reagent has volume 1 mL

19.73 g of reagent has volume 1/1.19*19.73 mL

                              = 16.58 mL

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