Question

9. Find the masses of sodium chloride and water required to obtain 175g of

a 15% solution.​

Answer 1

Answer:

Mass of sodium chloride = 26.25 g

Mass of water = 147.75 g

Explanation:

Mass% = (grams of solute)/(grams of solution) × 100

Here,

• Mass% = 15%

• Grams of solution = 175 g

Let the grams of sodium chloride be x.

15 = $\frac{x}{175}$ × 100

⇒ x = (15 × 175)/100

⇒ x = $\frac{2625}{100}$

⇒ x = 26.25 g

∴ Mass of Water = Total mass - Mass of sodium chloride

Let the mass of water be y.

⇒ y = 175 - 26.25

⇒ y= 147.75 g

∴ Mass of sodium chloride = 26.25 g

∴ Mass of water = 147.75 g

Answer 2

Answer:

Mass of NaCl - 26.25 gram, Mass of Water - 147.75 gram

Explanation:

mass percent = (gram solute/ grams solution) * 100

Let the mass of sodium chloride be x, then

15% = (x/ 175 gram) * 100

Solving for x

x = 15 * 175/ 100 x = 26.25

The solution consists of the sum of the amount of salt and water. Simply subtract the mass of salt from the solution to obtain the mass of water that is required:

Total mass - Mass of salt = Mass of water

175 g - 26.25 g = 147.75 g

Therefore, mass of salt and water is 26.25 g and 147.75 g respectively.

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