Find a concentration from a titration

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   A described curve for 25 mL of H₂SO₄ jumps at 30 mL of 0.1 M NaOH: H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O. What is the H₂SO₄ concentration, Ari?

   0.06 M
2. 2.

   A described curve for 20 mL of H₂SO₄ jumps at 16 mL of 0.25 M NaOH: H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O. What is the H₂SO₄ concentration, Bo?

   0.1 M
3. 3.

   Equal volumes of acids A and B need 20 mL and 40 mL of the same NaOH. How do their concentrations compare, Jun?

   • B is twice as concentrated
   • They are the same
   • A is twice as concentrated
4. 4.

   The jump is read 1 mL past its true place. Is the acid concentration found too high or too low, Kira?

   • Too high
   • Too low
   • Exactly right
5. 5.

   In OpenStax's example, 25.00 mL of HCl needs 25.00 mL of 0.100 M NaOH. What is the HCl concentration, Luz?

   • 2.5 M
   • 0.100 M
   • 0.0025 M
6. 6.

   Milo says the equivalence point is where equal volumes of acid and base have mixed. Agree or disagree?

   • Agree: the pH there is 1
   • Agree: the two volumes must match up
   • Disagree: equal moles, not volumes
7. 7.

   Noah says 20.0 mL of 0.10 M HCl always needs 20.0 mL of NaOH, whatever the NaOH concentration. Agree or disagree?

   • Agree: NaOH comes as 0.10 M
   • Agree: equal volumes of acid and base are needed
   • Disagree: it depends on NaOH's molarity
8. 8.

   Pia says 1 mol of H₂SO₄ needs the same moles of NaOH as 1 mol of HCl. Agree or disagree?

   • Disagree: it needs twice as many
   • Agree: sulfuric acid is weaker
   • Agree: any acid needs the same
9. 9.

   25.0 mL of HCl reaches equivalence with 25.0 mL of NaOH. What is the total volume then, Tala?

   • 50.0 mL
   • 625 mL
   • 25.0 mL
10. 10.

    A titration uses up 0.0025 mol of HCl with NaOH. How much NaCl forms, Zee?

    • 0.00125 mol
    • 0.005 mol
    • 0.0025 mol