The percentage or ratio strength (concentration) of a component in a pharmaceutical preparation is based on its quantity relative to the total quantity of the preparation. If the quantity of the component remains constant, any change in the total quantity of the preparation, through dilution or concentration, changes the concentration of the component in the preparation inversely. An equation useful in these calculations is: (1st quantity) ?x (1st concentration) ?= (2nd quantity) x? (2nd concentration) Show your complete solution. 1. A pharmacist needs 100 mL of 60% ethyl alcohol. If the available concentration of alcohol is 70%, compute for the volume of water and volume of 70% ethyl alcohol needed to prepare the desired concentration. Volume of 70% ethyl alcohol needed = Volume of water needed =
The percentage or ratio strength (concentration) of a component in a pharmaceutical preparation is based on its quantity relative to the total quantity of the preparation. If the quantity of the component remains constant, any change in the total quantity of the preparation, through dilution or concentration, changes the concentration of the component in the preparation inversely.
An equation useful in these calculations is:
(1st quantity) ?x (1st concentration) ?= (2nd quantity) x? (2nd concentration)
Show your complete solution.
1. A pharmacist needs 100 mL of 60% ethyl alcohol. If the available concentration of alcohol is 70%, compute for the volume of water and volume of 70% ethyl alcohol needed to prepare the desired concentration.
Volume of 70% ethyl alcohol needed =
Volume of water needed =
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