Phenacaine HCI 1% w/v Chlorobutanol 0.5% w/v 1.9% Boric Acid Solution ad 60 mL Make isotonic solution using boric acid. Sig. One drop in each eye. (Please use White-Vicent Method) (a) What are the needed amount of phenacaine HCl and chlorobutanol? (b) What is the required volume of 1.9% boric acid? (c) If you do not have 1.9% boric acid solution and have to compound from boric acid powder