Concentrated sulphuric acid has a density 1.9 g/mL and is 99 % H2SO4 by mass. Calculate the molarity of sulphuric acid. 

Concentrated sulphuric acid has a density 1.9 g/mL and is 99 % H2SO4 by mass. Calculate the molarity of sulphuric acid. 

Answer:

Given Values

WAcid = 99 gm

MAcid = H2SO4 = 2(1)+32+4(16) = 98

WSol = 100 gm

DSol = 1.9 gm/ml

VSol = \( \frac{W_{Sol}}{D_{Sol}} = \frac{100}{1.9} \) = 52.63 ml

Calculations

Molarity = \( \frac{W_{B} \times 1000}{M_{B} \times V_{Sol}} = \frac{99 \times 1000}{98 \times 52.63} \)

Molarity = 19.194 mol/L

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