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A solution of ammonia (NH_3) has a pH of 11.22. What is the original molarity of NH_3 in the solution? (Assume K_b for NH_3 is 1.8 × 10^{-5})
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6. Chemical Quantities & Aqueous Reactions
Molarity
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Which of the following is the correct unit for molarity?
A
mol/kg
B
g/L
C
L/mol
D
mol/L
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Understand that molarity is a measure of concentration defined as the number of moles of solute dissolved in one liter of solution.
Recall the formula for molarity: \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\).
Analyze each given unit option to see if it matches the formula: mol/kg (moles per kilogram of solvent) is molality, not molarity; g/L (grams per liter) is a concentration unit but not molarity since it uses mass instead of moles; L/mol (liters per mole) is the inverse of molarity.
Confirm that the correct unit for molarity is \(\text{mol}/\text{L}\), which directly corresponds to moles of solute per liter of solution.
Conclude that among the options, only \(\text{mol}/\text{L}\) correctly represents molarity.
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