posted by Dan_9 .
how do i do this \?
a 4.0mg/dl standard solution is needed. To prepare 100ml of the working standard. How much stock standard of a 1mg/ml (100mg/dl) solution is needed.
i don't understand this conceptually /
I don't get it either. Perhaps if you wrote all of the question and used proper punctuation the question might make sense.
copies straight from my notes
a 4.0mg/dL standard solution is needed. To prepare 100mL of the working standard, how much stock standard of a 1mg/mL solution is neeeded ?
i emailed her:I didn\t know what is a stock standard , working etc.
Stock standard is a standard prepared from manufacturer which is the most concentrated solution. It is then diluted to make a working standard in the lab. That working standard will be used as a standard to calibrate instrument or used for the experiment. It will become clearer after next week's lab. We'll be making serial dilution from a stock standard next week.
So in other words, the question is asking how many ml of stock standard with a concentration of 1 mg/ml needed to make 100 ml of 4.0 mg/dl concentration working standard.