A 20.0 ml sample of an unknown HCl solution requires titration with 15.0ml of 0.1MNaOH solution to reach equivalent point. What is the concentration of the HCl solution? HCl + NaOH �¨ H2O + NaCl
A. 0.000075
B. 75
C. none of these
D. 0.075
To determine the concentration of the HCl solution, we can use the concept of stoichiometry and the equation for the reaction between HCl and NaOH. Here's how to calculate the concentration:
1. Write the balanced equation for the reaction:
HCl + NaOH → H2O + NaCl
2. Calculate the number of moles of NaOH used in the titration:
Number of moles of NaOH = Volume of NaOH solution (in L) × Molarity of NaOH
Number of moles of NaOH = 0.015 L × 0.1 M = 0.0015 mol
3. Use the balanced equation to determine the ratio between HCl and NaOH:
From the equation, we can see that 1 mole of HCl reacts with 1 mole of NaOH.
4. Since the number of moles of NaOH used is equal to the number of moles of HCl, we can calculate the concentration of HCl:
Concentration of HCl = Number of moles of HCl / Volume of HCl solution (in L)
Concentration of HCl = 0.0015 mol / 0.020 L = 0.075 M
Therefore, the concentration of the HCl solution is 0.075 M, which corresponds to option D.