# The density of an aqueous solution

Could the density of an aqueous solution be less than 1g/ml ? For an example, can 0.98g/ml be taken as a density for an aqueous sulphuric acid solution ?

• Yes. With the exception of negative quantities or ones where the reaction quotient exceeds the solubility product, anything is fair game. – Todd Minehardt Dec 3 '18 at 19:14
• Sol. of H2SO4 tend to be denser then water. – Mithoron Dec 4 '18 at 19:32

Answer to your question, "could the density of an aqueous solution be less than $$\pu{1g/mL}$$," is yes. See following examples:
The density of the commercially available 28% ammonia solution ($$\ce{NH3}$$ 1n $$\ce{H2O}$$) is listed as $$\pu{0.9 g/mL}$$ at 25 °C (Sigma-Aldrich Catalog).
MERCK Tabellen für das Labor has listed the density of 35% ammonia solution ($$\pu{18 mol/L}$$ concentration) as $$\pu{0.88 g/mL}$$ at 20 °C (Steffen's Chemistry Pages)
As obvious, the densities of various aqueous ethanol solutions are also equal to less than unity since the density of absolute ethanol is $$\pu{0.789 g/mL}$$ at 20 °C (Wikipedia). By a quick google search, I found the densities of various aqueous ethanol solutions listed in MERCK Tabellen für das Labor in Steffen's Chemistry Pages, which is pretty interesting.