Question

a beaker contains 15.23 ml of water. 6.7 ml of the water is measured and transferred out. considering significant figures, what volume can you be confident is left in the beaker?

Explanation:

Step1: Set up subtraction

We need to subtract the volume of water transferred out from the initial volume. The initial volume of water is $15.23$ mL and the volume transferred out is $6.7$ mL. The operation is $15.23 - 6.7$.

Step2: Perform subtraction

$15.23-6.7 = 8.53$ mL.

Step3: Consider significant - figures

When subtracting, we look at the decimal places. $6.7$ has one decimal place. So our answer should be rounded to one decimal place. Rounding $8.53$ to one decimal place gives $8.5$ mL.

Answer:

$8.5$ mL