Concentration computations

Reference no: EM1392021

Question: A student needs 260 ml of buffer at the working concentration (1X) and has a 20X buffer stock. What volume of the 20X stock is needed? (Express your answer in ml to the nearest whole integer.)
I calculated 13 mL and when it says calculate to the nearest whole integer I rounded it down to 10mL, but this is not correct. what am I doing wrong?

Reference no: EM1392021

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