Pharmaceutical calculation practise questions

 1. Calculate the number of milliosmole corresponding to a 0.38g of Nacl?

2. Calculate the Osmolarity (mosmol/l) of  a solution containing 0.9% sodium chloride?

3. Rx cocaine hydrochliride (E=0.16)                0.6g

          Eucatropine hydrochloride (E=0.18)       0.6g

          Chlorobutanol (E=0.24)                           0.1g

           Sodium chloride                                     q.s

        purified water ad                                      30ml

      sign for the eye

How many grams of sodium chloride should be used in compounding the prescription?

4. Rx. oxymetazoline hydrochloride (E=0.20)                 1/2%

          Boric acid solution (E=0.52)                                   q.s

         purified water ad                                                         15ml

sig. For the nose, as decongestant

How many milliliters of a 5% of solution of boric acid should be used in compounding the prscription

5. What is the pH of a buffer solution prepared with 0.055M Sodium acetate and 0.01M acetic acid?

6. How many milliters of a 23.4% Nacl solution will be required to prepare one liter of 10% Nacl solution for irrigation using 0.9% Nacl solution and a 23.4% Nacl solution?

7. How many milligrams of diluent should be combined with 10grams of a 15% boric acid onintment to prepare a 12% boric acid ointment?

8. How many grams of petrolatum should be added to 200grams of a 20% ichtharamol ointment to make an 8% itchtharamol ointment?

9. How many grams of pure zinc oxide should be added to 400g of 10% zinc oxide ointment to prepare a 30% zinc ointment?

10.