Dilution calculations
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
0.25 L of 2 M salt water is diluted to 0.5 M. How much water is added, to 0.01 L, Esme?
0.1 L of 1.2 M sugar water is diluted to 0.4 M. How much water is added, to 0.01 L, Jun?
0.5 L of 0.6 M salt water is diluted to 0.2 M. How much water is added, to 0.01 L, Kira?
Bo says diluting salt water removes some of the salt. Which reply fits, Luz?
- Agree: the molarity falls because salt leaves
- Agree: the added water pushes some salt out
- Disagree: the salt stays, spread through more liters
Esme says that to halve a molarity, you double the volume of solution. Which reply fits, Milo?
- Disagree: halve the volume to halve the molarity
- Disagree: twice the volume quarters the molarity
- Agree: twice the volume gives half the molarity
Pia says M₁V₁ = M₂V₂ works with milliliters on both sides. Which reply fits, Noah?
- Agree: the units cancel if both volumes match
- Disagree: milliliters give a wrong answer here
- Disagree: milliliters change the moles of solute
2.0 M salt water is diluted to 1.0 M, then that to 0.25 M. By what total factor was it diluted, Pia?
- 6 times, adding the two factors
- 1.75 times, from 2.0 − 0.25
- 8 times
100 mL of 1.0 M sugar water is diluted to 250 mL; then 50 mL of that is diluted to 200 mL. What is the final molarity, Ren?
- 0.25 M, from the second step alone
- 0.10 M
- 0.40 M, after the first step alone
A student finds a diluted solution more concentrated than the original. What does that show, Zee?
- Nothing: water makes the salt stronger
- An error: dilution always lowers molarity
- Nothing: dilution can raise the molarity
0.30 L of 0.60 M salt water is diluted to 0.90 L, and a student gets 1.8 M. Which quick check catches the error, Ari?
- The answer should be below 0.60 M
- The answer should be above 0.60 M
- The answer should equal 0.60 M