10. Order: As pre-op, give morphine 8 milligrams Have:Morphine grain = (1)/(6) in 2 milliliters Morphine grain Give: __

## Step 1: Convert grains to milligrams<br />### We know that 1 grain is equal to 60 milligrams (approximation commonly used in medicine). The available morphine is $\frac{1}{6}$ grain per 2 mL. Therefore, the concentration is $(\frac{1}{6} \times 60)$ mg per 2 mL, which simplifies to 10 mg per 2 mL.<br /><br />## Step 2: Calculate the required volume<br />### We need to administer 8 mg of morphine. Since the concentration is 10 mg per 2 mL, we can set up a proportion: $\frac{10 \text{ mg}}{2 \text{ mL}} = \frac{8 \text{ mg}}{x \text{ mL}}$. Solving for $x$, we get $x = \frac{8 \times 2}{10} = \frac{16}{10} = 1.6$ mL.