Multiple Choice
What volume (in mL) of a 15% (m/v) NaOH solution contains 120 g NaOH?
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6. Chemical Quantities & Aqueous Reactions
Molarity
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What is the molar concentration of sodium ions (Na^+) in a 0.350 M Na_3PO_4 solution?
A
0.700 M
B
0.117 M
C
0.350 M
D
1.05 M
Verified step by step guidance1
Identify the chemical formula of the compound: sodium phosphate is Na\_3PO\_4, which means each formula unit contains 3 sodium ions (Na\^+).
Understand that the molar concentration of Na\_3PO\_4 given is 0.350 M, meaning there are 0.350 moles of Na\_3PO\_4 per liter of solution.
Since each mole of Na\_3PO\_4 produces 3 moles of Na\^+, multiply the molarity of Na\_3PO\_4 by 3 to find the molarity of Na\^+ ions.
Write the expression for the concentration of sodium ions: \(\text{[Na\^+]} = 3 \times 0.350\ \text{M}\).
Calculate the product to find the molar concentration of sodium ions in the solution.
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