Question

Rosa preparo una disolución de agua salada mezclando 120 mg de agua con 5 mg de sal comun ¿ que concentración tiene la disolución que preparo ?

Answer 1

Concentration of the solution (% mass) = 4%

Further explanation

Rosa prepared a salt water solution by mixing 120 mg of water with 5 mg of common salt, what concentration is the solution she prepare?

$\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%$

mass solute=mass of salt=5 mg

mass solution :

mass solute(salt)+mass solvent(water) :

$\tt 5~mg+120~mg=125~mg$

$\tt \%mass=\dfrac{5~mg}{125~mg}\times 100\%\\\\\%mass=4$