Concentrated hydrochloric acid is usually available at a concentration that is 3
ID: 808070 • Letter: C
Question
Concentrated hydrochloric acid is usually available at a concentration that is 37.7 percent by mass. What is its molar concentration if the density of the solution is 1.19 g/ml? Concentrated hydrochloric acid is usually available at a concentration that is 37.7 percent by mass. What is its molar concentration if the density of the solution is 1.19 g/ml? Concentrated hydrochloric acid is usually available at a concentration that is 37.7 percent by mass. What is its molar concentration if the density of the solution is 1.19 g/ml?Explanation / Answer
Molarity = moles of solute/vol of solution ---------------------- (1)
moles of solute = mass of solute/molecular weight of solute ------------(2)
HCL is 37.7 %; therefore,
Mass of solute = 0.377 x density x vol of solution ----------------(3)
Density of HCL is given as 1.19 g/ml
ml is 1/1000 L; MW of HCL is 36.45 g/mole
Thus substituting the above value in eq (1):-
molarity = (1000 (0.377)(1.19) / 36.45) X (moles/L)
= 12.3 moles/L = 12.3 M
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