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1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

6. Chemical Quantities & Aqueous Reactions

Solution Stoichiometry

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Solution Stoichiometry

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Multiple Choice

Calculate the molarity of an unknown sulfuric acid (H₂SO₄) solution if a 25.0 mL sample of the acid solution consumes 27.2 mL of 0.138 M NaOH solution in a titration. Assume the reaction is: H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O.

0.138 M

0.069 M

0.0756 M

0.150 M

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Verified step by step guidance

Start by writing the balanced chemical equation for the reaction:

{H 2}_{SO 4} + 2 NaOH \to {Na 2}_{SO 4} + 2 {H 2}_{O}

. This shows that one mole of

{H 2}_{SO 4}

reacts with two moles of

NaOH

Calculate the moles of

NaOH

used in the titration. Use the formula:

moles = molarity \times volume

. Convert the volume from mL to L by dividing by 1000:

27.2 \times 0.138 \times 0.001

Determine the moles of

{H 2}_{SO 4}

that reacted. Since the balanced equation shows a 1:2 ratio between

{H 2}_{SO 4}

and

NaOH

, divide the moles of

NaOH

by 2.

Calculate the molarity of the

{H 2}_{SO 4}

solution using the formula:

molarity = \frac{moles}{volume}

. Use the moles calculated in the previous step and the volume of the

{H 2}_{SO 4}

solution in liters (25.0 mL converted to 0.025 L).

Review the calculation steps to ensure accuracy and consistency with the balanced chemical equation and the stoichiometry involved. This will help verify the molarity of the sulfuric acid solution.

3:10m

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