Determine the largest possible value of the expression $ab+bc+ 2ac$ for non-negative real numbers $a, b, c$ whose sum is $1$.
To determine the largest possible value of the expression \( ab + bc + 2ac \) for non-negative real numbers \( a, b, c \) whose sum is \( 1 \), we can proceed as follows:

1. **Express \( a + c \) in terms of \( b \):**
   Since \( a + b + c = 1 \), we have:
   \[
   a + c = 1 - b
   \]

2. **Rewrite the expression \( ab + bc + 2ac \):**
   Substitute \( a + c = 1 - b \) into the expression:
   \[
   ab + bc + 2ac = b(a + c) + 2ac = b(1 - b) + 2ac
   \]

3. **Use the AM-GM inequality to bound \( 2ac \):**
   By the Arithmetic Mean-Geometric Mean (AM-GM) inequality, we have:
   \[
   a + c \geq 2\sqrt{ac}
   \]
   Since \( a + c = 1 - b \), it follows that:
   \[
   1 - b \geq 2\sqrt{ac}
   \]
   Squaring both sides, we get:
   \[
   (1 - b)^2 \geq 4ac
   \]
   Therefore:
   \[
   ac \leq \frac{(1 - b)^2}{4}
   \]

4. **Substitute the bound for \( ac \) into the expression:**
   Using the bound \( ac \leq \frac{(1 - b)^2}{4} \), we get:
   \[
   2ac \leq \frac{(1 - b)^2}{2}
   \]
   Thus:
   \[
   ab + bc + 2ac \leq b(1 - b) + \frac{(1 - b)^2}{2}
   \]

5. **Simplify the expression:**
   Let \( f(b) = b(1 - b) + \frac{(1 - b)^2}{2} \). We need to find the maximum value of \( f(b) \) for \( 0 \leq b \leq 1 \):
   \[
   f(b) = b(1 - b) + \frac{(1 - b)^2}{2} = b - b^2 + \frac{1 - 2b + b^2}{2} = b - b^2 + \frac{1}{2} - b + \frac{b^2}{2}
   \]
   Simplifying further:
   \[
   f(b) = \frac{1}{2} - \frac{b^2}{2}
   \]

6. **Find the maximum value of \( f(b) \):**
   Since \( f(b) = \frac{1}{2} - \frac{b^2}{2} \), it is clear that \( f(b) \) is maximized when \( b = 0 \):
   \[
   f(0) = \frac{1}{2}
   \]

7. **Verify the values of \( a \) and \( c \):**
   When \( b = 0 \), we have \( a + c = 1 \). The maximum value of \( 2ac \) occurs when \( a = c = \frac{1}{2} \):
   \[
   2ac = 2 \left( \frac{1}{2} \cdot \frac{1}{2} \right) = \frac{1}{2}
   \]
   Therefore, the maximum value of \( ab + bc + 2ac \) is:
   \[
   0 + 0 + \frac{1}{2} = \frac{1}{2}
   \]

The final answer is \(\boxed{\frac{1}{2}}\).