A chemist needs a solution for an experiment. The chemist knows that she is supposed to put 5.23g of a solid for every 2 L of solution that she wants. If she needs 15 L of solution, how much solid should she measure out?

Question

Quizplus · Accepted Answer

Ratios are used to show a relationship between two things. In this case, it is the relationship between the number of grams and number of liters in a solution. 5.23 g : 2 L First, we want to put the ratio into fractional form. You put the unit/amount you're trying to figure out (how much of the solid) as the numerator and the the unit/amount you know (amount of the liquid) as the denominator. ^{5.23 g}/_2L Then, we multiply this fraction by the number of liters she wants to make. This will give us the total number of grams needed to make the solution. ^{5.23 g}/_2L • 15L = ^78.45/_2L = 39.2 g Answer: She should measure out 39.2 grams.

A Chemist Needs a Solution for an Experiment