Who Cares about Titration?

Titration is used in industries because it enables quick determination of concentration of unknown solution. This process helps determine if a certain substance is neutralized or not. You can use a pH indicator to help. Once the color of the indicator changes accordingly then you have neutralized your solution. Here’s how it works!

First, prepare a buret.

Next, take your volume of solution you are using. 

Then you can put your amount of solution in a beaker or flask. Add a magnetic stirrer and an indicator which will tell you once the solution is neutralized. 

Next, slowly start letting your base drip into the acid. Watch this carefully because the color can change completely with one extra drop of base. Once you believe you have reached your end point you can take a distilled water squeeze bottle and rinse the sides of the beaker or flask to make sure all of the solution is together.  

Now, measure how much base you added to the acid and you can now figure out the concentration using M1V1=M2V2. In this equation plug in the initial molarity and volume of the known solution and set it equal to M2V2 which is the amount of volume in the buret after you finished times the molarity (which is what you are trying to figure out) and solve for M2!

In other words if you needed to figure out how much citric acid was in fruit juice the process would be the same! 

1) You would use ammonia to figure this out! So fill a buret with ammonia and place it on the buret clamp!

2) Then, measure out 50 mL of the fruit juice you are experimenting with and place it in an Erlenmeyer flask. 

3) Place 3 drops of your indicator, phenolphthalein, into the fruit juice! (this indicator will turn light pink when the solution is neutralized) 

4) Add ammonia from the buret into the flask until the color of the juice turns from pink to very very light pink. If the solution turns clear you have gone too far. 

5) Now all that is left is to do the M1V1=M2V2 calculations and you have determined the amount of citric acid in the fruit juice!



Class Lab




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