You are going to titrate 20 mL of .10M HCL with 0.10M NaOH. What is the pH at the equivalence point. How do I figure out the equivalence point when I have already figured out that the initial pH of the HCL and NaOH are both 1?
pH at the equivalence point is 7. That means the titration was complete, and the pH is neutral.
To find the pH at the equivalence point during the titration of HCl with NaOH, you need to consider the stoichiometry of the reaction. The balanced chemical equation for the reaction between HCl and NaOH is:
HCl(aq) + NaOH(aq) -> H2O(l) + NaCl(aq)
From the equation, you can see that 1 mole of HCl reacts with 1 mole of NaOH to form 1 mole of water and 1 mole of NaCl. This means that at the equivalence point, all of the HCl has reacted with an equal amount of NaOH, resulting in the formation of water and NaCl in a 1:1 ratio.
Since both the initial concentrations of HCl and NaOH are 0.10 M, the volume at the equivalence point can be determined using the principle of stoichiometry. The moles of HCl (nHCl) can be calculated by multiplying the initial concentration (0.10 M) by the volume of HCl used (in liters). Similarly, the moles of NaOH (nNaOH) can be calculated using the concentration and volume of NaOH used.
At the equivalence point, the moles of HCl and NaOH are equal, so you can set up the equation:
nHCl = nNaOH
(0.10 M)(volume of HCl) = (0.10 M)(volume of NaOH)
Now plug in the known values. You have 20 mL (0.020 L) of HCl and the concentration of HCl and NaOH is both 0.10 M.
(0.10 M)(0.020 L) = (0.10 M)(volume of NaOH)
From this, you can solve for the volume of NaOH used at the equivalence point.
Once you know the volume of NaOH used at the equivalence point, you can calculate the concentration of NaOH remaining and use that to find the concentration of the NaOH/NaCl solution at the equivalence point.
To find the pH at the equivalence point, you need to consider the hydrolysis of the NaCl. NaCl is a salt of a strong acid (HCl) and a strong base (NaOH). The resulting NaCl salt will not undergo hydrolysis, meaning it will not affect the pH of the solution. Therefore, the pH at the equivalence point will be neutral, around 7.
In summary, to determine the pH at the equivalence point during the titration of HCl with NaOH, you need to calculate the volume of NaOH used at the equivalence point using stoichiometry and then determine the concentration of the resulting NaOH/NaCl solution. Finally, consider the properties of the resulting salt to conclude that the pH at the equivalence point will be neutral.