A solution contains $ 25 ext{ g}$ of copper chloride salt in $ 250 ext{ g}$ of water. Calculate the concentr

Question

A solution contains $ 25	ext{ g}$ of copper chloride salt in $ 250	ext{ g}$ of water. Calculate the concentration in terms of mass by mass percentage of the solution.

Examoogle · Accepted Answer

The correct answer is Option A: 9.09%. To calculate the mass by mass percentage of a solution, we divide the mass of the solute by the total mass of the solution and multiply by 100. Here, mass of solute (copper chloride) = 25 g, mass of solvent (water) = 250 g, which gives total mass of solution = 25 g + 250 g = 275 g.

Step-by-Step Solution & Concepts:
To calculate the mass by mass percentage of a solution, we divide the mass of the solute by the total mass of the solution and multiply by 100. Here, mass of solute (copper chloride) = 25 g, mass of solvent (water) = 250 g, which gives total mass of solution = 25 g + 250 g = 275 g.

Working Principle: Mass percentage of a solution is defined as the mass of solute in grams dissolved in 100 grams of the solution. The formula is given by: $	ext{Mass percentage} = \left(\frac{	ext{Mass of solute}}{	ext{Mass of solution}}ight) 	imes 100$.

Key Formulas: $	ext{Mass percentage of solution} = \left( \frac{	ext{Mass of solute}}{	ext{Mass of solution}} ight) 	imes 100$; $	ext{Mass of solution} = 	ext{Mass of solute} + 	ext{Mass of solvent}$

Key Points: Solute is the component present in lesser amount (copper chloride = 25 g).; Solvent is the component in which solute is dissolved (water = 250 g).; Total mass of the solution includes both solute and solvent (25 + 250 = 275 g).; Mass percentage is a concentration term independent of temperature.

Advantages: Simple to calculate and does not require temperature corrections.

Disadvantages: Does not account for volume changes with temperature variations.

Applications: Preparing chemical reagents in laboratories; Determining concentration of commercial products like bleaching solutions and saline water

Additional Info: Commonly expressed as % w/w.. Option A (9.09%) correctly represents 25 / 275 	imes 100.

Answer: A is correct — The mass by mass percentage of the copper chloride solution is 9.09%.

Exam Tip: Always ensure that the denominator in concentration calculations represents the *total mass of the solution* (solute + solvent), not just the solvent mass!

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