Question

What mass of a $4.00 \%$ NaOH solution by mass contains 15.0 g of $\mathrm{NaOH}$ ?

   What mass of a $4.00 \%$ NaOH solution by mass contains 15.0 g of $\mathrm{NaOH}$ ?

Chemistry

Paul Flowers, Klaus… 2nd Edition

Chapter 3, Problem 70

Instant Answer

Solved by Expert Shalini Tyagi

10/03/2023

Step 1

We know that the solution is 4.00% NaOH by mass, which means that for every 100 g of solution, there are 4 g of NaOH. Now, we need to find out how many grams of solution contain 15.0 g of NaOH. We can set up a proportion to solve for the mass of the solution Show more…

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What mass of a $4.00 \%$ NaOH solution by mass contains 15.0 g of $\mathrm{NaOH}$ ?

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Key Concepts

Mass Percent Concentration

Mass percent concentration is a way of expressing the concentration of a solute in a solution as the mass of the solute divided by the total mass of the solution, multiplied by 100. It represents how many grams of a particular solute are present in 100 grams of the solution. This concept is vital for determining proportions and for preparing solutions with specific concentrations.

Algebraic Setup for Proportional Calculations

When working with solutions specified by mass percent concentration, setting up an algebraic equation is essential for determining unknown quantities such as the total mass of the solution needed. This involves using the relationship: (total mass of solution) × (mass percent / 100) = mass of solute. Solving this equation requires basic algebraic manipulation to isolate the desired variable.

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