Solutions game: concentration in g/L, % by mass and solubility
A chemistry game for mastering solutions with drawn beakers. Each beaker shows the grams of solute on top and the volume below, and its colour gets stronger the more concentrated the solution is, but only when you answer: before that they all share the same shade, so it does not give the answer away. You tell solute from solvent in everyday mixtures (seawater, air, bronze, vinegar), work out concentration in g/L, decide which beaker is most concentrated, find the percentage by mass, work out how much stays undissolved in a saturated solution and, on the hard level, dilute with c₁·V₁ = c₂·V₂ and calculate molarity.
Chemistry · Secondary, Sixth form
Concentration in g/L divides by litres, not millilitres; percentage by mass is worked out on the total (solute plus solvent), not just the water; and adding water does not change the amount of solute. There are no options to guess between: you type the result, and if it is wrong the explanation does the sum properly step by step.
In the three-beaker question, the one with the most grams is never the most concentrated: it also has much more water. It forces you to divide instead of looking at a single number, which is exactly what people misunderstand about concentration.
Air is a solution of gases, and bronze or steel are solid ones. Asking which is the solute and which the solvent makes the rule clear: the solvent is the component present in the larger amount, whether liquid, gas or solid.
"Three beakers: A has 40 g of salt in 1000 mL, B has 20 g in 250 mL and C has 10 g in 200 mL. Which is most concentrated? A has more salt, but you have to divide: A = 40 ÷ 1 = 40 g/L; B = 20 ÷ 0.25 = 80 g/L; C = 10 ÷ 0.2 = 50 g/L. B is the most concentrated, and when you answer you can see it: its beaker turns the darkest violet."
Prefer to learn without screens? Try this analogue version:
Fill three identical glasses with 100, 200 and 300 mL of water and add a teaspoon of food colouring or drinking chocolate to each.
Put them in order from lightest to darkest before stirring, then check whether you were right.
Work out each concentration in teaspoons per litre: the one with the least water is the most concentrated.
Add water to the darkest until it matches another one and note how much it took: that is diluting.
If you like Make the Solution, these activities work similar skills:
Another chemistry game: how to separate mixtures, including evaporating the water from a solution to get the salt back.
Another chemistry game about solutions: acidic, neutral and basic on the pH scale.
A science game on melting, boiling and condensing, which is what happens when you evaporate a solution.
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