question at the bottom.
this applies to both 70% dilutions and 95% dilutions. for all intensive purposes I will be referring to making 70% alcohol from 100% absolute. I am aware of volume loss when mixing these two. measuring devices used are 1000ml flask and 500mL flask(no pipetting).
method A.) take one gallon of absolute alcohol. With a marker, make a mark to indicate the bottle at its original volume. Now poor out 200mL of absolute alcohol. proceed to fill the bottle of alcohol with distilled water until it is even with the original volume.
Method B.) take one gallon of absolute alcohol(round 3,785mL to 4,000mL). poor out 1,200mL of absolute alcohol. Poor in exactly 1,200mL of distilled water back into the alcohol bottle.
Method C.) take one gallon of absolute alcohol. poor out 1,135mL of absolute alcohol. poor in exactly 1,135mL of distilled water back into the alcohol bottle.
I just started a new job, and method A. was being used to dilute alcohol. however management was unaware of how the alcohols were being diluted. and when management was informed that method A. was being used, method B. was enforced. Q> which method will give me the most accurate results? if method C. is the best, I would prefer to use it. thanks to all who read this and double thanks to those who respond.