Post-Lab Questions 1. Calculate the pH of the solution formed when 45.0 mL of 0.100 M NaOH is added to 50.0 mL of 0.100MCH_(3)COOH. (K_(a)=1.8times 10^-5)

Question

Answer 1

The pH of the solution is 11.72.

Answer 2

## Step 1First, we need to calculate the new concentrations of

and

after the addition of the two solutions. ### **

**### **

**## Step 2With the new concentrations, we create the following initial equilibrium system once

is added to the

.### **

**Initial:### **

**Change:### **

**Final:### **

**## Step 3We now plug this into the Ka expression for acetic acid.### **

**Substituting the values, we get:### **

**Solving this quadratic equation, we find

, which represents the concentration of

.## Step 4We now solve for pOH and then for pH.### **

**### **

**

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