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

6. Chemical Quantities & Aqueous Reactions

Solution Stoichiometry

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Solution Stoichiometry

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Multiple Choice

What is the concentration of chloride ions in the solution formed by mixing 3.50 g of NaCl with 40.9 mL of 0.407 M CaCl2 solution, assuming the volumes are additive?

0.814 M

0.407 M

0.203 M

0.610 M

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Verified step by step guidance

First, calculate the number of moles of NaCl using its molar mass. The molar mass of NaCl is approximately 58.44 g/mol. Use the formula: \( \text{moles of NaCl} = \frac{\text{mass of NaCl}}{\text{molar mass of NaCl}} \).

Next, determine the concentration of chloride ions from the NaCl. Since NaCl dissociates completely in water, it provides one mole of chloride ions per mole of NaCl. Calculate the concentration using the formula: \( \text{Concentration of Cl}^- = \frac{\text{moles of Cl}^-}{\text{total volume of solution in liters}} \).

Calculate the moles of chloride ions from the CaCl2 solution. Since CaCl2 dissociates into two chloride ions per formula unit, use the formula: \( \text{moles of Cl}^- = 2 \times \text{moles of CaCl2} \). First, find the moles of CaCl2 using \( \text{moles of CaCl2} = \text{volume in liters} \times \text{molarity} \).

Add the moles of chloride ions from both NaCl and CaCl2 to find the total moles of chloride ions in the solution.

Finally, calculate the total concentration of chloride ions in the solution by dividing the total moles of chloride ions by the total volume of the solution in liters. Use the formula: \( \text{Concentration of Cl}^- = \frac{\text{total moles of Cl}^-}{\text{total volume of solution in liters}} \).