Which of the following solutions has the highest concentration?

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Question: Which of the following solutions has the highest concentration?

Options:

Correct Answer: 0.3 M MgSO4

Solution:

Concentration in terms of molarity: 0.1 M NaCl = 0.1, 0.2 M KCl = 0.2, 0.05 M CaCl2 = 0.15 (0.05*3), 0.3 M MgSO4 = 0.3. Highest is 0.3 M MgSO4.

Which of the following solutions has the highest concentration?

Which of the following solutions has the highest concentration?

Step 1: Understand that concentration can be measured in molarity (M), which tells us how many moles of a substance are in one liter of solution.
Step 2: Look at the given solutions and their molarity values: 0.1 M NaCl, 0.2 M KCl, 0.05 M CaCl2, and 0.3 M MgSO4.
Step 3: Calculate the effective concentration of CaCl2. Since CaCl2 dissociates into 3 ions (1 Ca^2+ and 2 Cl^-), we multiply its molarity by 3: 0.05 M * 3 = 0.15 M.
Step 4: Now we have the following concentrations: 0.1 M for NaCl, 0.2 M for KCl, 0.15 M for CaCl2, and 0.3 M for MgSO4.
Step 5: Compare all the concentrations: 0.1, 0.2, 0.15, and 0.3.
Step 6: Identify the highest concentration, which is 0.3 M from MgSO4.

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