Question

which of the following tools should be used to accurately measure large volumes of liquid? (>5 ml) beaker erlenmeyer flask graduated cylinder my water bottle how many microliters are in a milliliter? 0.001 10 1,000,000 1000 if i want to make 6 ml of 2% red dye 40 solution, how much red dye would i add to the total mixture? 1.2 ul 120 ul 30 ul 3 ul

Explanation:

Step1: Recall liquid - measuring tools

Beakers and Erlenmeyer flasks are for general holding and mixing, not highly accurate for measuring. A water - bottle is not a scientific measuring tool. Graduated cylinders are designed for accurate volume measurement of liquids, especially for larger volumes ( > 5 mL).

Step2: Recall volume unit conversion

The prefix "micro -" means $10^{- 6}$ and "milli -" means $10^{-3}$. So, $1\ mL=1000\ \mu L$ since $10^{-3}\ L\div10^{-6}\ L = 1000$.

Step3: Calculate amount of red dye

The solution is 2% red dye. To find the volume of red dye in 6 mL of solution, we use the formula $V_{dye}=V_{solution}\times\%$ (in decimal form). 2% is 0.02 in decimal form. So $V_{dye}=6\ mL\times0.02 = 0.12\ mL$. Since $1\ mL = 1000\ \mu L$, then $0.12\ mL=0.12\times1000\ \mu L = 120\ \mu L$.

Answer:

1. C. Graduated Cylinder
2. D. 1000
3. B. 120 ul