Table of contents

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

18. Aqueous Equilibrium

Titrations: Strong Acid-Strong Base

General Chemistry

18. Aqueous Equilibrium

Titrations: Strong Acid-Strong Base

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Multiple Choice

A 25.00 mL sample of 0.175 M HCl is being titrated with 0.250 M NaOH. What is the pH after 17.50 mL of NaOH has been added?

1.00

12.00

7.00

2.00

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Verified step by step guidance

Start by calculating the moles of HCl initially present in the solution using the formula: \( \text{moles} = \text{concentration} \times \text{volume} \). For HCl, use \( 0.175 \, \text{M} \times 25.00 \, \text{mL} \). Remember to convert mL to L by dividing by 1000.

Next, calculate the moles of NaOH added using the same formula: \( \text{moles} = \text{concentration} \times \text{volume} \). For NaOH, use \( 0.250 \, \text{M} \times 17.50 \, \text{mL} \). Again, convert mL to L.

Determine the moles of HCl that remain after the reaction with NaOH. Since HCl and NaOH react in a 1:1 ratio, subtract the moles of NaOH from the initial moles of HCl to find the remaining moles of HCl.

Calculate the concentration of the remaining HCl in the solution. Use the formula: \( \text{concentration} = \frac{\text{moles}}{\text{total volume}} \). The total volume is the sum of the initial HCl volume and the added NaOH volume, converted to liters.

Finally, use the concentration of HCl to find the pH. Since HCl is a strong acid, the pH can be calculated using the formula: \( \text{pH} = -\log[\text{H}^+] \), where \([\text{H}^+]\) is the concentration of HCl.