Which is the thickest solution-1(M) of syrup or 1(m) of syrup?
A 1 mol/L sucrose syrup is thicker (has a greater viscosity) than a 1 mol/kg solution.
We would predict that the more concentrated solution has the greater viscosity.
To confirm this, we must express both concentrations in the same units.
Convert a concentration of 1 mol/kg to a molarity.
The molar mass of sucrose (
A 1 mol/kg solution contains 342 g of sucrose in 1 kg of water.
A 1 mol/kg solution of sucrose has a concentration of 0.824 mol/L.
A 1 mol/L solution of sucrose is more concentrated than a 1 mol/kg solution, so it should be thicker.
(Confirmation: The viscosity of a 1 mol/kg solution is 2.52 times the viscosity of water, and the viscosity of a 1 mol/L solution is 3.26 times the viscosity of water.)