e. Practical Exercises. Work the following problems and check your answers
with the correct answers found on page 2-42.
(1) How many milliliters of water must be added to 5 gallons of 100%
isopropyl alcohol to make a 70% dilute Isopropyl alcohol?
ANS: ___________ ml
(2) How many grams of coal tar and how many grams of 1% coal tar
ointment must be combined to make 200 grams of 4% coal ointment?
ANS: ___________ g coal tar
___________ g 1% ointment
(3) How many grams of coal tar must be added to 200 grams of 1% coal tar
ointment to make a 4% coal tar ointment?
ANS: ___________ g coal tar
(4) How many grams of 1% coal tar ointment must be added to 200 grams of
coal tar to make a 4% coal tar ointment?
ANS: ___________ g 1% ointment
(5) A 25% solution of ethyl alcohol may be used to bathe a small child for the
purpose of cooling and reducing fever. How many milliliters of ethyl alcohol (95%) and
how many milliliters of distilled water must be combined to make two quarts of the 25%
ethyl alcohol solution?
ANS: ___________ ml 95%
___________ ml water
MD0802
2-39