Question

You are asked to measure out approximately 10 mL of a salt solution.How would you measure this volume out if the solution comes in a bottle and you onlyhave a teaspoon?How would you measure this volume out if the solution comes in a drop bottle and youhave no other measuring devices?1 mL contains approximately 20 drops (1 mL = 20 drops).

Answer 1

1) List known values

1mL = 20 drops

1 teaspoon = 4.93 mL

List unknown values

Number of teaspoons to get 10mL of solution.

Process

1. Count 80 drops of solution in the teaspoon. (4mL)

2. Pour the teaspoon into a flask.

3. Repeat step 1 one more time and pour into the flask. (4mL)

4. Count 40 drops of solution in the teaspoon and pour into the flask. (2mL)

The flask contains 4mL+4mL+2mL = 10mL