What is the most effective way to wash laboratory glassware? Assume that you have a 1.0 L flask that contains 5 ml, of residual droplets of a 1.0 M NaCL solution. You can rinse the flask with a total volume of 1.0 L of pure water ([NaCI] = 0.000 M). Consider the following options: (o) Fill the Bock up completely once, adding the full 1.0 L of pure water. Shake the flask to mix well, and empty it.
(b) Add one-third of the water, shake to mix, empty, and repeat two more times.
In each case, assume that .5 ml. of the making mixture of clean and dirty water is left after each rinse.
For your answer, calculate the concentration of NaCI that would result in case (a) and in case (b) if the remaining NaCI in the flask were diluted to 1.0 L with pure water. Discuss your results.