Find a concentration from a titration

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A described titration reaches equivalence after 25 mL of 0.1 M NaOH. How many moles of NaOH is that, Ari?

   0.0025 mol
2. 2.

   A described titration reaches equivalence after 30 mL of 0.15 M NaOH. How many moles of NaOH is that, Esme?

   0.0045 mol
4. 3.

   Using the curve, at what volume of NaOH is the equivalence point, Jun?

   • 50.0 mL
   • 10.0 mL
   • 25.0 mL
5. 4.

   Using the curve, what is the pH at the equivalence point, Kira?

   Use the picture in question 3.

   • 12.52
   • 7.00
   • 1.00
6. 5.

   Using the curve, how do you spot the equivalence point, Luz?

   Use the picture in question 3.

   • Where the curve ends
   • Where the pH jumps steeply
   • Where the pH is at its lowest
7. 6.

   What is the equivalence point of a titration, Milo?

   • Where the solution runs out
   • Where the two volumes become equal
   • Where moles of OH⁻ match moles of H⁺
8. 7.

   In a described titration, what is the titrant, Noah?

   • The solution whose strength is being found
   • The solution of known concentration
   • The salt that forms
9. 8.

   Why does a titration of HCl with NaOH reach pH 7 at equivalence, Pia?

   • The salt left is neutral
   • The water boils off as steam
   • NaOH is a weak base
10. 9.

    What is 25.0 mL in liters, Ren?

    • 2.50 L
    • 0.0250 L
    • 25,000 L
11. 10.

    How do you find moles from molarity and volume, Tala?

    • Molarity × liters
    • Liters ÷ molarity
    • Molarity ÷ liters