# Which is the thickest solution-1(M) of syrup or 1(m) of syrup?

##### 1 Answer

A 1 mol/L sucrose syrup is thicker (has a greater viscosity) than a 1 mol/kg solution.

#### Explanation:

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.

The density

A 1 mol/kg solution of sucrose has a concentration of 0.824 mol/L.

**Conclusion:**

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.)