Multiple Choice
What is the molarity of Na+ ions in the solution formed by mixing 42.0 mL of 0.180 M NaOH and 37.6 mL of 0.410 M NaOH, assuming the volumes are additive?
6. Chemical Quantities & Aqueous Reactions
Molarity
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the concentration (M) of KCl in a solution made by mixing 30.0 mL of 0.100 M KCl with 50.0 mL of 0.100 M KCl?
A
0.100 M
B
0.050 M
C
0.200 M
D
0.150 M
Verified step by step guidance1
Calculate the moles of KCl in the first solution using the formula: \( \text{moles} = \text{concentration} \times \text{volume} \). For the first solution, use 0.100 M and 30.0 mL (convert mL to L by dividing by 1000).
Calculate the moles of KCl in the second solution using the same formula: \( \text{moles} = \text{concentration} \times \text{volume} \). For the second solution, use 0.100 M and 50.0 mL (convert mL to L by dividing by 1000).
Add the moles of KCl from both solutions to find the total moles of KCl in the mixed solution.
Calculate the total volume of the mixed solution by adding the volumes of the two solutions: 30.0 mL + 50.0 mL. Convert this total volume from mL to L by dividing by 1000.
Determine the concentration of KCl in the mixed solution using the formula: \( \text{concentration} = \frac{\text{total moles of KCl}}{\text{total volume in L}} \).
Related Videos
Related Practice
