Which of the following concentration units will not change if the solution is heated?
A) %(w/w)
B) %(w/v)
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

Percent by weight (w/w) is a mass concentration unit, which is determined by the mass of solute divided by the total mass of the solution and expressed as a percentage. As the mass of the solution does not change with temperature, %(w/w) concentration will not change if the solution is heated. On the other hand, %(w/v) expresses the mass of solute dissolved in a certain volume of solution, which will change with temperature due to the change in volume. Therefore, the correct answer is A) %(w/w).

Which of the Following Concentration Units Will Not Change If