A student titrates HCl with 0.0125M KOH. Starting with 50.00 ml of the acid it takes 40.0 ml of base to reach equilavence point.
A. What is the concentration of the HCl?
B. What is the initial pH of the acid solution?
C. What is the pH of the reaction mixture after the addition of 20.00 ml of base?
D. What is the pH at equivlance point?
E. What is the pH after the addition of 50.00 ml of the base?
To solve these titration-related questions, you need to understand the concept of titration and use the equations related to acid-base reactions.
Let's break down each question and explain how to find the answers:
A. What is the concentration of HCl?
To find the concentration of HCl, you can use the formula for calculating the concentration of a solution:
M1V1 = M2V2
In this case, M1 represents the concentration of the HCl solution, V1 represents the volume of the HCl solution (50.00 mL), M2 represents the concentration of the KOH solution (0.0125 M), and V2 represents the volume of the KOH solution required to reach the equivalence point (40.0 mL).
Plug in the given values into the formula and solve for M1:
M1 * 50.00 mL = (0.0125 M) * 40.0 mL
B. What is the initial pH of the acid solution?
To find the initial pH of the acid solution, you can use the equation for calculating pH:
pH = -log[H+]
Since HCl is a strong acid, it dissociates completely in water, meaning that the concentration of H+ ions in the solution is equal to the concentration of HCl. Use the concentration of HCl from part A to calculate the concentration of H+ ions and then find the pH.
C. What is the pH of the reaction mixture after the addition of 20.00 mL of base?
To find the pH of the reaction mixture after the addition of 20.00 mL of base, you need to determine the moles of HCl remaining after reacting with the added base. From the moles of HCl, you can find its new concentration and calculate the pH using the same formula as in part B.
D. What is the pH at the equivalence point?
At the equivalence point, all the HCl has reacted with the KOH, resulting in the formation of water. The pH at this point is determined by the water formed, which is neutral with a pH of 7.
E. What is the pH after the addition of 50.00 mL of base?
After the addition of 50.00 mL of base, there is an excess of KOH in the solution. To find the pH, you need to calculate the concentration of OH- ions resulting from the excess KOH and then use the equation for pOH to find the pH.
To solve these questions, you have to perform the necessary calculations based on the given information and formulas.