Multiple Choice
Two acid solutions are prepared: Solution A contains 0.50 mol of HCl dissolved in 1.0 L of water, and Solution B contains 0.25 mol of HCl dissolved in 0.5 L of water. Which solution is more concentrated?
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6. Chemical Quantities & Aqueous Reactions
Molarity
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What is the concentration of nitrate ions in a 1.5 M aqueous solution of aluminum nitrate, Al(NO_3)_3?
A
3.0 M
B
1.5 M
C
4.5 M
D
0.5 M
Verified step by step guidance1
Identify the chemical formula of aluminum nitrate: \(\mathrm{Al(NO_3)_3}\). This means each formula unit contains 1 aluminum ion and 3 nitrate ions.
Understand that when aluminum nitrate dissolves in water, it dissociates completely into its ions: \(\mathrm{Al(NO_3)_3 \rightarrow Al^{3+} + 3NO_3^-}\).
Given the concentration of aluminum nitrate is 1.5 M, recognize that for every 1 mole of \(\mathrm{Al(NO_3)_3}\) dissolved, 3 moles of \(\mathrm{NO_3^-}\) ions are produced.
Calculate the concentration of nitrate ions by multiplying the concentration of aluminum nitrate by the number of nitrate ions per formula unit: \([NO_3^-] = 1.5\,M \times 3\).
Express the nitrate ion concentration in molarity units, which will give the final concentration of nitrate ions in the solution.
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