ALLIGATION METHOD PHARMACY CALCULATIONS PDF

The calculation is set up in Figure 6. Figure 6 1. Now, these numbers need to be converted to a measurable quantity, such as grams. How much 2.

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But when is it better to use the alligation approach as opposed to the algebraic method? Before I tell you, let us take a look at this interesting concentration questions and see how it illustrates an important concept regarding when it is better to use the alligation method.

Now, there are two ways you can solve this problem. For these types of problems where you have two concentrations and the desired concentration falls between the two concentrations, the alligation approach actually works better than the algebraic method. It is typically faster. See step-by-step solution in the video and keep reading. The first step is to set up the alligation grid. Now the way alligation setup works is we want to find out what the number of parts of the gel base is going to be.

So we subtract the 0 from 2 and that gives us 2 and that goes to the top right of the grid. We can repeat the process above. In which case we will take the parts of the gel base which is 3 and divide that by the total parts which is 5 and then multiply the result by the total quantity which again is 60 grams and that should give us 36 grams.

Whenever you have a concentration calculation problem where you have two different strengths and your desired strength falls between those two concentrations, it is often better to use the alligation method rather than the algebraic method. The alligation method tends to be faster in those cases. Tell us about it by leaving a comment. Also, feel free to share any other great ideas too.

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1 Super Tip on When to Use the Alligation Method to Solve Concentration Calculations Questions

It is highly useful for the pharmacy technicians to quickly estimate alligation ratio and then to prepare solutions of desired concentration from available stock solutions. Is this method different from dilution? Yes,of course, but not completely different. When water is used as one of the solvent alligation simply becomes a dilution technique. In all other cases, alligation plays unique role in pharmacy calculations.

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Notes on the Use of Alligation Method in Pharmaceutical Practice

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