Question

B. If the prescription above was modified as follows: Rx: EEEEEE Tetracaine Hydrochloride 0.2% Epinephrine Bitartrate in NSS* Boric Acid Purified Water ad Make isoton. Sol. Sig: Gtts ii q 12 h ou *Normal Saline Solution Solution How many milligrams of boric acid are needed to make this solution isotonic? (Show all of your work. Truncate your answer to 1 decimal place.)

Answer 1

If 1% boric Acid required be x ml

The focus in the blend will be 1/100* x = 0.01x

The parity 30-x ml will be 5% arrangement

The convergence of this in the blend will be 0.05*(30-x)

The convergence of the all out blend will be 0.03 * 30

0.01x+0.05(30-x)= 0.03*30

0.01x+ 1.5 - 0.05x = 0.9

- 0.04X=-0.6

X=0.6/0.04

X=15ML 1% solution

Parity 15 ml will be 3% sol.