Multiple Choice
Calculate the molarity of an unknown sulfuric acid (H₂SO₄) solution if a 25.0 mL sample of the acid solution consumes 27.2 mL of 0.138 M NaOH solution in a titration. Assume the reaction is: H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O.
6. Chemical Quantities & Aqueous Reactions
Solution Stoichiometry
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What is the concentration of a solution of HCl in which a 10.0 mL sample of acid required 50.0 mL of 0.150 M NaOH solution for neutralization?
A
0.600 M
B
0.300 M
C
0.750 M
D
0.150 M
Verified step by step guidance1
Start by writing the balanced chemical equation for the neutralization reaction between HCl and NaOH: .
Identify the stoichiometry of the reaction. From the balanced equation, we see that 1 mole of HCl reacts with 1 mole of NaOH.
Use the formula for molarity: , where is the number of moles and is the volume in liters.
Calculate the moles of NaOH used in the reaction: . Substitute M and L.
Since the stoichiometry is 1:1, the moles of HCl will be equal to the moles of NaOH. Use the moles of HCl and the volume of the HCl solution (converted to liters) to find its concentration using the molarity formula.
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