Question

A 100.-mL sample of water is taken from the Pacific Ocean, and the water is allowed to evaporate. The salts that remain (mostly NaCl) have a mass of 3.85 g. Calculate the original concentration of NaCl, in g per liter, in the water sample.

Answer 1

Answer:

10

Explanation:

Answer 2

Evaporation is the method of separating the solute from the solvent of the solution. The original concentration of the salt NaCl in the water sample is 38.5 g/L.

What is concentration?

Concentration or molarity is the mass of the solute dissolved in a litre of the solution and is represented as M.

Molarity or the concentration can be given by the formula,

$\rm Molarity = \dfrac{\text{Mass of solute}}{\text{Volume of solution in L}}$

Given,

• Mass of the salt NaCl = 3.85 gm
• The volume of the sample water = 100 mL

Substituting values in the above equation:

$\begin{aligned}\rm M &= \dfrac{3.85\;\rm g}{0.1\;\rm L}\\\\&= 38.5 \;\rm g/L\end{aligned}$

Therefore, the original concentration of NaCl is 38.5 g/L.

Learn more about concentration here:

https://brainly.com/question/7053858