MediumChemistryHigh School (9–10)GeneralMixtures and Solutions › Mixtures, Solutions and ColloidsNumericalBoard Exam

A chemist pours 40 mL of ethanol into a flask and adds water until the solution measures 250 mL…

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A chemist pours $40\ \text{mL}$ of ethanol into a flask and adds water until the solution measures $250\ \text{mL}$ . What is the concentration of ethanol as a volume by volume percentage?

Need a reminder? The key ideaShow

Mass by mass $\% = \dfrac{\text{mass of solute}}{\text{mass of solution}} \times 100$ , where the solution is solute plus solvent. Volume by volume $\% = \dfrac{\text{volume of solute}}{\text{volume of solution}} \times 100$ .

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

← All Problems

← A jar holds 380 g of brine that is 9 % salt by mass…At 293 K, 36 g of common salt dissolves in 100 g of water to make a saturated solution… →

More onMixtures and Solutions › Mixtures, Solutions and Colloids

Discussion (0)

Loading…