What is the amount of sodium chloride salt in milligrams to be added to the following ophthalmic preparation to make it isotonic? Naphazoline hydrochloride 1%  Sodium chloride salt qs to make solution isotonic  Sterile water qs ad 30 mL  Sodium chloride equivalent for naphazoline is 0.27 a. 0.27g b. 0.25g c. 0.20g d. 0.19g

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What is the amount of sodium chloride salt in milligrams to be added to the following ophthalmic preparation to make it isotonic?

Naphazoline hydrochloride 1% 
Sodium chloride salt qs to make solution isotonic 
Sterile water qs ad 30 mL 
Sodium chloride equivalent for naphazoline is 0.27

a.

0.27g

b.

0.25g

c.

0.20g

d.

0.19g

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