If 100. ml of a 5.0 M solution is heated on a hot plate until the volume is cut in half, what will the concentration be?

Final concentration = 10 M

Explanation:

Given data:

Initial volume = 100 mL

Initial molarity /concentration= 5 M

Final volume = 50 mL

Final molarity/concentration = ?

Solution:

Formula:

M₁V₁ = M₂V₂

M₁ = Initial molarity

V₁ = Initial volume

M₂ = Final molarity

V₂ = Final volume

Now we will put the values.

5 M × 100 mL = M₂ ×  50 mL

500 M.mL = M₂ ×  50 mL

M₂ = 500 M.mL / 50 mL

M₂ = 10 M

the answer for sodium is 0.186

the answer for rubidium is 0.251