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

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