<p>29.2% (w/w) HCl stock solution has a density of 1.25g&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><msup><mi>L</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The molecular weight of HCl is 36.5 g&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The volume (mL) of stock required to prepare a 200 mL solution of 0.4 M HCl is:</p>