8. A 1:750 w/v solution of benzalkonium chl of the benzalkonium solution and 77

Question

8. A 1:750 w/v solution of benzalkonium chl of the benzalkonium solution and 77 parts of purified water is recommended for bladder urethral irri loride diluted with purified water in a ratio of 3 parts gation. What is the ratio strength of benzalkonium chloride in the final dilution? How many milliliters of undecylenic acid should be added to 30 mL of a 20% v/v undecylenic acid topical solution to change its concentration to 25% v/v? 9, 10. How many milliliters of a syrup having a specific gravity of 1.350 should be mixed with 3000 mL of a syrup having a specific gravity of 1.250 to obtain a product having a specific gravity of 1.310?

Explanation / Answer

8.

For diluting we put 3 parts solution with 77 parts water,

So we are making it 3/(77+3) =3/80 as concentrated as before.

Hence ratio strength of benzalkonium chloride in the final dilution is :

(1/750)×3/80 = 0.00005 or 1/20,000

Hence 1:20,000 w/v

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