Chemistry: 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 ?

Rosa preparo una disolución de agua salada mezclando

courtneygaffney4755

08.01.2021

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) :

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

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

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BluSeaa

18.09.2021

Yes because otherwise it is a physical change. when the two reactants combine or when a new substance is formed it is then a chemical change.

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