Question

How would the freezing point of seawater compare with that of pure water? a)higher b) lower c) the same d) ten times higher

Answer 1

Answer:

Freezing point of seawater is lower as compared to pure water

Explanation:

Seawater contains salts like $MgCl_{2}$, NaCl etc.

According to colligative properties of molecules, presence of solute in a pure solvent lowers freezing point of pure solvent obeying the following equation-

                                        $\Delta T_{f}=k_{f}.m$

where $\Delta T_{f}$ is lowering of freezing point, $k_{f}$ if cryogenoscopic constant of solvent and m is molality of solution.

In seawater, water is the solvent and $MgCl_{2}$, NaCl etc are solutes.

Hece freezing point of seawater is lower than pure water

Answer 2

The answer would be B) Lower, because pure water freezes at 32 degrees Fahrenheit whereas salt water freezes at 28.4 degrees Fahrenheit. Hopefully this helps!