in one of the routine analyses, dr entropy found that the concentration of phosphate had increased from 0.0090 mg/l to 0.220 mg/l. this will require a lengthy investigation and detailed report into the causes. being the master of disorder, he considers an act of serious scientific misconduct - diluting the sample to reduce phosphate concentration to the maximum allowable level of 0.100 mg/l, and hoping that no-one notices.

if the volume of the original sample with concentration 0.220 mg/l is 10.0 ml, what should be the final volume of solution in order to dilute it to 0.100 mg/l?